answersLogoWhite
Science
Clouds
Chemical Energy

What energy is needed to change a material from solid to liquid?

596061

Top Answer
User Avatar
Wiki User
2017-12-14 03:16:03
2017-12-14 03:16:03

Heat energy, usually. However, some substances will change states under the influence of UV or other radiation.

Answer

The energy needed to change a material from a solid to a liquid is called the 'latent heat of fusion', or just the 'heat of fusion'. It is equal to the amount of energy or heat given off by the same material to change it from a liquid back into a solid.

Each material has its own heat of fusion. Take solid water (ice) at 0o Celsius, the freezing point. Water's heat of fusion is 79.71 calories per gram. That means that you will need to add 79.71 calories of heat to each gram of ice (solid water) to turn it into liquid water. Interestingly, once that's done, the water will still be at 0o Celsius! The heat was used just to change the water's state from solid to liquid. Once the ice is liquid, then any more heat added will increase the temperature of the liquid, and each calorie of heat will increase the water's temperature about 1o Celsius.

This is a similar concept to a material's 'heat of vaporization', which is the amount of energy required to change a liquid to a gas.
The amount of heat necessary to change a substance from a solid to a liquid or vice versa is commonly called the heat of fusion. It is more properly known as the standard enthalpy of fusion, or also the latent heat of fusion, or the enthalpy change of fusion. The specific temperature at which the change occurs is defined as the melting point of that substance. A link can be found below.
The amount of energy a substance must absorb in order to change from a solid to a liquid is the heat of fusion. A change in which a system absorbs energy from its surroundings is endothermic change.

1

Related Questions

User Avatar

Heat energy is needed to change a solid to a liquid.

User Avatar

To change a material from liquid to gas, more kinetic energy is needed. This is supplied by heating the material or giving it thermal energy.

User Avatar

It is the latent heat of liquefaction.

User Avatar

You must meet the "heat of vaporization"

User Avatar

Usually heat is needed. but this can happen through osmosis as well.

User Avatar

heat. a liquid will start to boil when the pressure in the liquid equals the atmospheric pressure

User Avatar

heat is a mesure of energy the more energy the hotter it is so depending on its melting point is how much energy/heat is needed

User Avatar

The energy needed to change a substance from a liquid to a gas is called the enthalpy (or heat) of vaporization.

User Avatar

Heat of fusion. (I have no idea what the "propane or water" part is supposed to mean.)

User Avatar

thermal energy is needed to do that job. as opposed to mechanical potential or chemical energies.

User Avatar

Every material is different, and it also depends on the pressure.For water (ice) at standard atmospheric pressure, it's 54 calories per gram.

User Avatar

the amount of energy needed to change a solid to a liquid at its melting point is heat of fusion.Joshua DavisBaton Rouge, LaCentral High School

User Avatar

it depends on the compound... for example going from liquid water to gaseous water you need 44 KJ of energy..

User Avatar

It depends on the liquid you've got. But it's called the Latent Heat of Vapourisation

User Avatar

You can add heat and cause liquid to gasify. Or you can decrease the pressure in the system and cause liquid to gasify. Note that you may gasify liquid and leave suspended or dissolved solids behind. More heat or pressure may be required to convert these remnants to liquid and then gas.

User Avatar

Changing a chocolate from soild to liquid requires the absroption of energy.

User Avatar

thermal energy is needed because it makes the particles less dense, move faster, and spread farther apart, changing it into a gas.

User Avatar

The heat of fusion, also known as the enthalpy of fusion is how much energy is required to melt a solid to a liquid. This is the energy required to change the phase of the material - not the temperature. In fact at the melting point the heat capacity becomes infinite because all the energy is being used to change state and not temperature.As energy cannot be created or destroyed it is reasonable to assume it is the same amount of energy for a liquid to turn into a solid, which it is.So if energy is needed to change the phase of ice into water, the same amount of energy is released when water changes back into ice.


Copyright © 2020 Multiply Media, LLC. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.