|
Changes of phase most always require _________. |
a transfer of energy |
|
What are the four common phases of matter? |
Solid, liquid, gas, plasma |
|
Evaporation is a change of phase _________. |
from liquid to gas |
|
Condensation is a change of phase _________. |
from gas to liquid. |
|
The inside surface of a glass window becomes wet when the temperature outside is _________. |
colder |
|
What is condensation? Is condensation a warming or cooling process? |
Condensation is when a gas becomes a liquid. It is a warming process. |
|
Why is a steam burn more damaging than a burn from boiling water at the same temperature? |
The steam releases considerable energy when it condenses to liquid on the skin. |
|
Why do you feel uncomfortably warm on a hot and humid day? |
Cooling sweat does not evaporate well in humid air. |
|
Why does water vapor in the air condense when the air is chilled? |
Cool air contains more slow water molecules, which stick together more often when they collide. |
|
Boiling is evaporation that mainly occurs _________. |
below the surface and throughout water |
|
Distinguish between evaporation and boiling. |
Evaporation happens at a liquid surface, whereas boiling occurs in the bulk of the liquid. |
|
Does increased atmospheric pressure increase or decrease the boiling point of water? Why? |
Increase. Higher pressure collapses the bubbles that form. |
|
Why doesn’t energy added to boiling water increase the temperature of the water? |
Boiling is a cooling process, so energy is removed as quickly as it is added. |
|
When will water boil at a temperature lower than 100°C? |
At pressures lower than atmospheric pressure. |
|
Melting and freezing are _________. |
opposite processes |
|
Why does increasing the temperature of a solid make it melt? |
Increasing the temperature increases molecular vibrations until attractive forces can no longer hold the molecules in one place. |
|
Why does decreasing the temperature of a liquid make it freeze? |
Cooling slows molecular motion until attractive forces between molecules can hold them in place. |
|
Does a liquid release energy or absorb energy when it changes into a gas? Into a solid? |
Absorb, release. |
|
Does a solid release energy or absorb energy when it changes into a liquid? When it sublimes into a gas? |
Absorb, absorb. |
|
How many calories are needed to change the temperature of 1 g of water by 1°C? To melt 1 g of ice at 0°C? To vaporize 1 g of boiling water at 100°C? |
1 calorie, 80 calories, 540 calories. |
|
When you step out after a hot shower you feel cold, but you can feel warm again if you step back into the shower area. Which process is responsible for this? |
Condensation – steam condenses on your body causing it to warm up. |
|
The process of boiling |
All of the above – cools the water being boiled, depends on atmospheric pressure, and is a change of phase below the water surface. |
|
Sara lies on a bed of sharp nails without harm because |
her weight is distributed over hundreds of nails. |
|
A dam is thicker at the bottom than at the top mainly because |
pressure increases with depth. |
|
The buoyant force acting on a 10 ton ship floating in the ocean is |
10 tons |
|
When an object is partly or wholly immersed in a liquid, it is buoyed up |
By a force equal to the weight of liquid displaced. |
|
Lobsters live on the bottom of the ocean, which means their density is |
greater than the density of sea water |
|
To multiply an applied force while using a simple hydraulic lift, your force should be applied to the |
small-diameter piston. |
|
Atmospheric molecules do not fly off into outer space due to |
Earth gravitation. |
|
When a suction cup sticks to a wall it is |
pushed to the wall by the atmosphere. |
|
Inside the same room, buoyant force is greater on |
an elephant. |
|
When you blow air between a pair of closely-spaced Ping-Pong balls suspended between strings, the ball will swing |
toward each other. |
|
Temperature is most closely related to molecular |
kinetic energy. |
|
Heat energy travels from an object with a high |
internal energy to an object with a lower internal energy. |
|
A substance that cools down faster than others has a |
low specific heat capacity. |
|
When most substances are heated, molecules inside move faster and take up more space, resulting in thermal |
expansion. |
|
When you touch a nail stuck in ice, energy flows from |
your hand to the ice. |
|
Blow on your hand with your mouth open. Then do the same with your lips puckered and you’ll find |
the breath from the puckered lips is cooler. |
|
If a pizza radiates more energy than it absorbs, its temperature |
decreases. |
|
The reason that evaporation is a cooling process is |
the more energetic molecules escape the liquid. |
|
A canteen that is wet on the outside results in water inside that is |
cooler. |
|
Compared to sea level, water in an open pot in the mountains boils at |
a lower temperature. |
|
The temperature at which water freezes is the same as the temperature at which |
ice melts. |
|
As a block of ice at 0°C melts, the block absorbs energy |
without a temperature change. |
|
Changes of phase most always require _________. |
a transfer of energy |
|
What are the four common phases of matter? |
Solid, liquid, gas, plasma |
|
Evaporation is a change of phase _________. |
from liquid to gas |
|
Do the molecules in a liquid all have about the same speed, or do they have a wide variety of speeds? |
Some are slow and some are fast. |
|
What is evaporation? |
Evaporation is when the fastest molecules at the surface of a liquid have escape velocity and leave to become a gas. |
|
Why is evaporation a cooling process? |
When the fastest molecules leave during evaporation, the slower, cooler ones remain. |
|
What is sublimation? Is it a heating or cooling process? |
Sublimation is when the fastest molecules at the surface of a solid have escape velocity and leave to become a gas. It leaves behind the slower, cooler molecules. |
|
Condensation is a change of phase _________. |
from gas to liquid |
|
The inside surface of a glass window becomes wet when the temperature outside is _________. |
colder |
|
What is condensation? Is condensation a warming or cooling process? |
Condensation is when a gas becomes a liquid. It is a warming process. |
|
Why is a steam burn more damaging than a burn from boiling water at the same temperature? |
The steam releases considerable energy when it condenses to liquid on the skin. |
|
Why does water vapor in the air condense when the air is chilled? |
Cool air contains more slow water molecules, which stick together more often when they collide. |
|
Why does warm, moist air form clouds when it rises? |
Rising air expands and cools. Water drops condense when moist air cools. |
|
Boiling is evaporation that mainly occurs _________. |
below the surface and throughout water |
|
The purpose of a pressure cooker is to _________. |
prevent cooling from occurring |
|
Boiling can occur in cold water when _________. |
pressure is sufficiently lowered |
|
Distinguish between evaporation and boiling. |
Evaporation happens at a liquid surface, whereas boiling occurs in the bulk of the liquid. |
|
What happens to the water pressure at the bottom of a geyser when some of the water above gushes out? What is the result? |
As water rushes out, the pressure on the remaining water is reduced, so the water boils. |
|
Why doesn’t the water at the bottom of a geyser boil when it is at 100°C? |
It is under pressure from the water above. |
|
Why does increasing the temperature of a solid make it melt? |
Increasing the temperature increases molecular vibrations until attractive forces can no longer hold the molecules in one place. |
|
Melting and freezing are _________. |
opposite processes |
|
Why does decreasing the temperature of a liquid make it freeze? |
Cooling slows molecular motion until attractive forces between molecules can hold them in place. |
|
Why doesn’t water freeze at 0°C when foreign molecules or ions are present? |
Foreign molecules or ions get between water molecules and ice crystals, thus impeding crystal formation. |
|
Does a liquid release energy or absorb energy when it changes into a gas? Into a solid? |
Absorb, release |
|
Does a solid release energy or absorb energy when it changes into a liquid? When it sublimes into a gas? |
Absorb, absorb |
|
Describe the condensation, evaporation, and heat flows that happen in a refrigerator. |
Liquid evaporates inside the refrigerator, absorbing energy. Gas condenses outside the refrigerator, releasing energy. |
|
<b>release energy</b> This is because a liquid has more KE kinetic energy then a solid, and when it changes phases into a solid it has to release that energy. |
Does a liquid release energy or absorb energy when it changes into a solid? -release energy -absorb energy |
|
<b>-Both freezing point and melting point are the same for a pure substance</b> The melting and freezing point is the temperature in between the point at which molecules of a substance either gain KE and move apart, or lose KE and gain more molecular bonds. |
How does the freezing point of a liquid compare with its melting point? -Freezing point is less than melting point for a pure substance. -Freezing point is greater than melting point for a pure substance. -Both freezing point and melting point are the same for a pure substance. |
|
<b>absorb energy</b> The is because the a liquid has a lower kinetic energy than a gas, and to change into a gas it has to absorb energy. |
Does a liquid release energy or absorb energy when it changes into a gas? -absorb energy -release energy |
|
<b>none of these</b> 80 calories is absorbed to melt 1 gram, so to melt 50 grams 50*80= 4000 cal |
To melt 50 grams of 0-degree-Celsius ice requires 50 calories. 25 calories. 80 calories. none of these |
|
<b>more calories than are required to bring 50 grams of ice at absolute zero to the boiling point.</b> absolute zero is about -273, and it takes 4.187 calories for water to be raised one degree. it takes 373 degree to reach 100 C, 373<b>4.187= </b>1561.8 Cal* But … since it take 540 cals to vaporize 1 gram of water |
To turn 50 grams of boiling water to steam requires -500 calories -more calories than are required to bring 50 grams of ice at absolute zero to the boiling point. -540 calories. -50 calories. -None of the above choices are correct. |
|
<b>a transfer of energy</b> When a substance goes through a phase change it almost always needs to release energy, or absorb energy. |
Changes of phase almost always require _______. -electron transfer -a condition of thermal equilibrium -a transfer of energy -an absence of molecular contact |
|
<b>colder</b> Condensation occurs more in cold air, because molecules slow down, allowing them to bump into each other and form chemical bonds with each other. |
The inside surface of a glass window becomes wet when the temperature outside is _______. -colder -either warmer or colder -warmer -almost exactly the same as on the inside |
|
<b>below the surface and throughout water</b> this occurs when bubbles in the liquid form when the pressure of the vapor inside the bubbles is great enough to resist the pressure of the surrounding liquid. |
Boiling is evaporation that mainly occurs _______. -below the surface and throughout water -at the bottom of a container of heated water -at the surface of water -when water becomes overly hot |
|
<b>pressure is sufficiently lowered</b> lowered pressure at high altitudes decrease the boiling point of a liquid. boiling depends not only on temperature, but on pressure as well. |
Boiling can occur in cold water when _______. -concentration and physics come together -sub-zero temperatures are achieved -pressure is sufficiently increased -pressure is sufficiently lowered |
|
<b>vaporizes</b> In one gram of water it takes 540 cal to take water from a liqid form and vaporize it in to a gas form. It only takes 80 cal to melt it |
Most energy transfer occurs in water when it _______. -vaporizes -melts -increases from its melting temperature to its boiling temperature -freezes |
|
<b>a great variety of speeds.</b> Molecules in liquid water have wide variety of speeds. Some gain KE, while others lose KE |
The molecules in a room-temperature glass of water jostle around at -a very small range of speeds. -a great variety of speeds. -much the same rates of speed. |
|
<b>a warming process.</b> When condensation occurs excess KE, is shared with the liquid, and this increases the liquids temperature. |
Evaporation is a cooling process and condensation is -a warming process. -a cooling process also. -neither a warming nor cooling process. |
|
<b>the more energetic molecules are able to escape the liquid.</b> Molecules about to be propelled out of the liquid gain energy, while those that remain in the liquid lose energy. Thus the average kinetic energy of the molecules remaining in the liquid is lowered. Therefore cooling the liquid. |
Evaporation is a cooling process because -heat is radiated during the process. -the temperature of the remaining liquid decreases. -of conduction and convection. -the more energetic molecules are able to escape the liquid. -none of these |
|
<b>to help evaporation occur in its mouth and bronchial tract.</b> Since they have no sweat glands dogs pant, this causes evaporation to occur in its mouth and bronchial tract. Since evaporation is a cooling process it cool the dogs off. |
A hot dog pants -to bring more oxygen into its lungs. -to help evaporation occur in its mouth and bronchial tract. -for no particular reason – some things just happen. -to impress dogs of the opposite sex. |
|
<b>condensing on our bodies</b> If condensation exceeds evaporation, you are warmed |
We feel uncomfortably warm on a muggy day because water molecules are -condensing on our bodies. -evaporating and condensing on our bodies at the same rate. -evaporating from our moist bodies. |
|
<b>transfer some of their kinetic energy to us.</b> condensation is a warming process |
We are warmed by condensation because water molecules in the air that strike our bodies -transfer some of their kinetic energy to us. -form an insulating layer on our bodies. -gain kinetic energy as they change state. |
|
<b>release energy.</b> This is because a liquid has more KE kinetic energy then a solid, and when it changes phases into a solid it has to release that energy. |
When liquids change to a solid state, they absorb energy. release energy. neither absorb nor release energy. both absorb and release energy. |
|
<b>100 g of steam at 100 degrees C</b> this is because you don’t just feel the heat of the steam, but when the steam condenses after heating wet skin, it releases high amounts of energy |
Which could burn a boy scout the most? -100 g of steam at 100 degrees C -100 g of water at 100 degrees C -Both would be equally damaging. |
|
<b> does not change</b> When energy is added to a liquid at the boiling temperature, it converts the liquid into a gas at the same temperature. the energy added to the liquid goes into breaking the bonds between the liquid molecules without causing the temperature to change. |
When heat is added to boiling water, its temperature increases. does not change. decreases. |
|
<b> goes up</b> If atmospheric pressure is raised then the molecules in the vapor that form the bubbles inside the boiling liquid need to move at a fast rate, to prevent the bubbles from collapsing. |
For increased atmospheric pressure, the boiling temperature of a liquid goes up. remains at 100 degrees C. goes down. |
|
<b> prevent boiling.</b> If atmospheric pressure is raised then the molecules in the vapor that form the bubbles inside the boiling liquid need to move at a fast rate, to prevent the bubbles from collapsing. |
Increased air pressure on the surface of hot water tends to promote boiling. prevent boiling. Neither choice A nor choice B is true. Choice A and choice B are both true. |
|
<b> a lower temperature than at sea level.</b> If atmospheric pressure is lowered then the molecules in the vapor that form the bubbles inside the boiling liquid don’t need to move as fast to prevent the bubbles from collapsing due to the force of the lower force of atmospheric pressure. Thus, a liquid under less pressure is able to form bubbles more easily and is able to boil faster, because there is less atmospheric pressure acting on it. |
Near the top of a mountain, water in an open pot boils at a lower temperature than at sea level. the same temperature as at sea level. a higher temperature than at sea level. None of the above choices are true. |
|
<b>faster</b> glass with no ice will warm faster, water at zero Celsius will warm more quickly. Because Energy must first go into melting the ice at zero Celsius. |
Compared to a glass of ice water with ice in it, a glass of plain ice-cold water without ice on a warm day will warm up slower. faster. in the same amount of time. None of the above choices are true. |
|
<b> 100 calories</b> Because1 calorie raises 1 gram of water 1 degree. so… to raise raise 1 gram of water 2 degree would = 2 50 grams X 2 = 100 |
To increase the temperature of 50 grams of water by 2 Celsius degrees requires 0.04 calorie. 25 calories. 100 calories. 4.18 calories. 2 calories. |
|
<b>higher temperature</b> The food is able to be cooked at this higher temperature in a pressure cooker because the higher pressure of the cooker puts a pressure force on the liquid and and causes the molecules in the vapor that form the bubbles inside the boiling liquid to move at a faster rate and causes the bubbles to collapse more easily. Thus a liquid under pressure, is able to cook longer and the temperature is able to get hotter before it begins to boil. |
Food in a pressure cooker is cooked faster because of the increased internal energy in the water. greater rate of bubble formation in the water. higher temperature. Choices A, B, and C are all true. |
|
<b> warmer</b> Condensation is a warming process. Excess KE of the liquid from its gas phase is transferred to the liquid when it condenses. |
When water vapor condenses on the inside of a window, the room becomes slightly warmer. cooler. neither warmer nor cooler. |
|
<b>the saturation of cooled air</b> If the number of molecules returning to the layer exactly |
On a humid day, water condenses on the outside of a glass of ice water. This phenomenon occurs mainly because of adhesion of water molecules to glass. evaporation. the porosity of glass. the saturation of cooled air. capillary action. |
|
<b> raises the boiling point of water.</b> Since boiling is a cooling process, it causes a liquid to cool. By raising the boiling point it prevents the water from cooling a quickly, and allows the food to cook in a higher temperature. |
An inventor discovers a harmless and tasteless salt, which changes its boiling point when added to water. The market value for this salt will be best if the salt raises the boiling point of water. either raises or lowers the boiling point, as the food would be cooked either way. lowers the boiling point of water. |
|
<b>7200</b> It takes 80 cals, for 1g of ice to melt, 100 cal to boil it, and 540 cals to vaporize it. so… 80<b>100</b>540=720 cal 720 cal * 10 = 7200cal |
The calories needed to change 10 grams of ice at zero degrees C to steam at 100 degrees C is 6400. 7200. 6200. 8000. None of the above choices are correct. |
|
<b> the water in them contains dissolved salts and sugars</b> |
Stored potatoes, beets, and rutabagas freeze at temperatures below zero degrees Celsius (rather than at exactly zero) because they are good radiators of energy. they are good absorbers of radiant energy. they are very dense. the water in them contains dissolved salts and sugars. All of the above choices are true. |
|
<b>absorbs energy from its environment.</b> As the ice cube melts, it absorbs heat energy from its surroundings. Water molecules frozen in the form of ice are tightly bound. Water molecules in the form of liquid aren’t. So to turn a solid into a liquid means breaking bonds, and that takes energy. |
When a block of ice at zero degrees Celsius melts, the ice absorbs energy and gets warmer. releases energy and gets warmer. releases energy to its environment. absorbs energy from its environment. |
|
<b>evaporation</b> This is because hot water has more H2o molecules with higher KE, this causes more of them to be bumped to the surface of the liquid, and break free of the liquid in to a gas phase. |
Hot water has a relatively high rate of evaporation. conductivity. convection. condensation. |
|
<b>even colder</b> Because frost occurs when water condenses on objects. And Condensation is a warming process. Excess KE of the liquid from its gas phase is transferred to the liquid when it condenses. |
A substance can be sprayed on crops to prevent frost formation under many conditions. If frost did not form on the fields and woods of an entire continent, cold nights would be no different. less cold. even colder. |
|
<b>boil the eggs for a longer time.</b> Since boiling not only depends on tempreture but also on pressure, the lower the atmospheric pressure, as in this case in a higher altitude, the less speed the molecules of the vapor must move to produce a bubble in a liquid |
If you want to cook eggs by boiling them while in the mountains, then compared to sea-level cooking, you should use a hotter flame. boil the eggs for a longer time. boil the eggs for a shorter time. None of the above choices are true. |
|
<b>by putting it in an environment that has as little pressure on it as possible, such as a vacuum which has no atmospheric pressure</b> |
How can you bring water to a boil without giving it any heat? |
|
<b>Due to the higher amount of water vapor in the air of NYC there is a higher amount of condensation. Since condensation exceeds evaporation it causes you </b> |
Why is a humid summer in NYC is less comfortable than a dry summer in Tucson, AZ? |
|
Evaporation |
The change of phase from liquid to gaseous. |
|
Sublimation |
The change of phase from solid to gaseous, skipping the liquid phase. |
|
Condensation |
The change of phase from gaseous to liquid. |
|
Boiling |
Rapid evaporation that takes place within a liquid as well as at its surface. |
|
Regelation |
The process of melting under pressure and the subsequent refreezing when the pressure is removed. |
|
Heat pump |
A device that transfers heat out of a cool environment and into a warm environment. |
|
Latent heat of fusion |
The amount of energy required to change a unit mass of a substance from solid to liquid (and vice versa). |
|
Latent heat of vaporization |
The amount of energy required to change a unit mass of a substance from liquid to gas (and vice versa). |
|
Wrapping a hot potato in aluminum foil significantly reduces the rate at which it cools by |
evapoaration |
|
The molecules in a room-temperature glass of water jostle around at |
a great variety of speeds |
|
The reason that evaporation is a cooling process is |
the more energetic molecules escape the liquid |
|
When you blow over hot soup to cool it you are helping |
conduction, convection, and radiation |
|
A hot dog pants |
to enable evaporation in its mouth and bronchial tract |
|
The surface of hot water has a relatively high rate of |
evaporation |
|
What occurs in a pan of water placed outdoors on a warm day? |
both of these |
|
A canteen that is wet on the outside results in water inside that is |
cooler |
|
Double-pane windows contain nitrogen rather than air to prevent |
condensation |
|
The toy drinking bird nicely illustrates |
both of these |
|
When fast-moving water molecules collide they tend to |
rebound without sticking |
|
When slow-moving water molecules collide they tend to |
stick |
|
The main difference between a fog and a cloud is |
altitude |
|
The pressure at the bottom of a geyser is |
greater than nearer the top |
|
When a geyser erupts, pressure at its bottom |
decreases |
|
Evaporation is a cooling process and condensation is |
a warming process |
|
A boy scout will be burned more severely by |
100 g of steam at 100°C |
|
Steam burns are more damaging than burns caused by boiling water because steam |
both of these |
|
We feel uncomfortably warm on a muggy day because water molecules are |
condensing on our bodies |
|
On a muggy day, water molecules in the air that strike our bodies |
transfer some of their kinetic energy to us |
|
Morning dew on the grass is a result of |
slow-moving water molecules sticking to one another |
|
Food in a pressure cooker is cooked faster due to |
higher temperature |
|
In mountain regions, food cooked in boiling water cooks slower than when cooked at sea level. If the temperature beneath the pot of boiling water is increased, the food will cook |
neither of these |
|
Compared with sea-level cooking, in cooking eggs by boiling in mountain regions you should boil the eggs |
for a longer time |
|
Water can be brought to a boil by |
both of these |
|
When heat is added to boiling water, its temperature |
remains unchanged |
|
For increased atmospheric pressure, the boiling point of water |
rises |
|
Increased air pressure on the surface of hot water tends to |
prevent boiling |
|
Compared to sea level, water in an open pot in the mountains boils at |
a lower temperature |
|
A geyser such as Old Faithful in Yellowstone Park is similar to a |
coffee percolator |
|
Hydrothermal vents deep beneath the ocean surface attain temperatures far above 100°C due to |
greater pressure |
|
Water can be turned to ice by |
both of these |
|
A good cook knows that the temperature of violently boiling water is |
the same as that of simmering water |
|
In one word, how can water in the power plant of a nuclear submarine far exceed 100°C? |
pressure |
|
Water in a car radiator sometimes boils explosively when the radiator cap is removed, which is due to sudden |
reduced pressure |
|
An inventor discovers a harmless and tasteless salt, which when added to water changes its boiling point. The market value for this salt will be better if the salt |
raises the boiling point of water |
|
The addition of salt to water affects its |
freezing point |
|
The temperature at which water freezes is the same as the temperature at which |
ice melts |
|
The temperature at which a liquid freezes is |
the same temperature at which its solid form melts |
|
Foreign ions introduced to water |
lower the freezing point of water |
|
Dean teaches that the phenomenon of regelation is due to the |
open-structured nature of ice crystals |
|
To illustrate regelation with ice it is important that a |
wire is used |
|
Absorbed by the vapor |
When vapor transforms to a plasma, energy must be |
|
No pieces of metal are among the coals |
When you walk barefoot on red-hot wooden coals it is best if |
|
slow-moving water molecules sticking to one another. |
Morning dew on the grass is a result of |
|
Extracting energy, lowering the surrounding air pressure Both of these |
Water can be turned to ice by |
|
without a temperature change. |
As a block of ice at 0°C melts, the block absorbs energy |
|
A warming process |
Evaporation is a cooling process and condensation is |
|
Prevent boiling |
Increased air pressure on the surface of hot water tends to |
|
Coffee percolator |
A geyser such as Old Faithful in Yellowstone Park is similar to a |
|
Neither of these- faster, slower still |
In mountain regions, food cooked in boiling water cooks slower than when cooked at sea level. If the temperature beneath the pot of boiling water is increased, the food will cook |
|
Warmer |
When water vapor condenses on the inside of a window, the room becomes slightly |
|
Altitude |
The main difference between a fog and a cloud is |
|
1 kg of wood |
Which will melt more ice when placed on its surface, a kilogram of wood or a kilogram of iron of the same high temperature? |
|
Condensation, evaporation Both of these |
What occurs in a pan of water placed outdoors on a warm day? |
|
Warmed |
When steam condenses, the surrounding air is |
|
Conduction, convection, and radiation |
When you blow over hot soup to cool it you are helping |
|
The formation of ice |
Rapid evaporation of hot water can lead to |
|
Wet |
If bits of the coals do not stick to your feet while walking barefoot on red-hot coals, it would be best if your feet are |
|
Evaporation |
The surface of hot water has a relatively high rate of |
|
Broken into smaller pieces |
Ice is put in a cooler to cool the contents. To speed up the cooling process, the ice can be |
|
Cool the surrounding air |
Melting snow tends to |
|
Stick |
When slow-moving water molecules collide they tend to |
|
Open structured nature of ice crystals |
Dean teaches that the phenomenon of regelation is due to the |
|
Warmer |
When water vapor changes phase to become water in a cloud, the surroundings become |
|
Sprayed as a fine mist |
Firefighters find that the temperature of burning material is best lowered when water is |
|
Evaporation |
Wrapping a hot potato in aluminum foil significantly reduces the rate at which it cools by |
|
Colder |
When condensation occurs inside your bedroom window, the air outside is appreciably |
|
100 calories |
To increase the temperature of 50 grams of water by 2 Celsius degrees requires |
|
The condensation of 1 gram of steam at 100 degrees C to water at 100 degrees C |
Which involves a larger number of calories? |
|
Warm an environment, cool and environment Both of these |
A heat pump can |
|
Reduced pressure |
Water in a car radiator sometimes boils explosively when the radiator cap is removed, which is due to sudden |
|
The formation of ice |
Rapid evaporation of hot water can lead to |
|
Without a temperature change |
As a block of ice at 0°C melts, the block absorbs energy |
|
Ice melts |
The temperature at which water freezes is the same as the temperature at which |
|
7200 |
The calories needed to change 10 grams of ice at 0°C to steam at 100°C is |
|
Pressure |
In one word, how can water in the power plant of a nuclear submarine far exceed 100°C? |
|
Warmed |
When water freezes, the surrounding air is |
|
Temperature |
The most responsible factor for whether a substance takes the phase of solid, liquid, gas, or plasma is its |
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