When you heat ice on a hot stove, the ice melts. Heat energy is being transferred from the stove to the ice.
What is heat energy?
Heat energy is the energy transfer due to the difference in temperature. It is also called thermal energy. Heat energy is of three different types.
- When transfer of energy is from one molecule to another by direct contact, it is called conduction.
- When movement of heat by a liquid like water or air, then it is called convection.
- When electromagnetic waves transfer the heat, it is called Radiation.
In melting the ice on a hot stove, Conduction of heat is used. The melting temperature of ice is same as freezing temperature i.e. 0°C. At specific temperature, difference in temperature can make water to change its state.
Heat energy is used to fragment the hydrogen bonds that hold the molecules in the ice together. When heat energy is additional, then ice melts into liquid water. It reaches its temperature– 0°C. Still apply heat, and therefore the water can develop into water vapours, that is water in its gaseous state. The temperature of water does not alter until all the ice melts. When all the ice is melted, the heat energy then starts increasing the temperature of water.
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