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When ice thaws, the latent heat that was absorbed during the freezing process is released back into the surroundings. This heat energy is used to break the bonds holding the water molecules in the solid ice structure, allowing them to move more freely and transition into liquid form.
The value of the latent heat of fusion of ice in the British English system of units is approximately 144 Btu/lb.
"Latent heat" refers to the heat energy absorbed or released during a change of state without a change in temperature. For example, when ice melts into water, heat is absorbed from the surroundings without a rise in temperature, which is the latent heat of fusion. Similarly, when water vapor condenses into liquid water, heat is released without a decrease in temperature, known as the latent heat of condensation.
When ice melts, the energy is used to break the hydrogen bonds holding the water molecules together. This energy is then stored as latent heat in the liquid water. If the ice is heated further, the energy will increase the temperature of the water.
No, the amount of heat required to boil 1kg of water is much higher than the amount of heat required to melt 1kg of ice. Boiling water requires additional heat to overcome the latent heat of vaporization, while melting ice only requires heat to overcome the latent heat of fusion.
When water vapor condenses into liquid water, latent heat is released. Similarly, when liquid water freezes into ice, latent heat is also released. These changes of state involve the release of latent heat because energy is being released as the water molecules transition to a lower energy state.