A sceince student in a science fair demonstrated the existence of water and ice in a same container at `0^(@)C` and water and steam in a same closed container at `100^(@)C` explain how is it possible to have two different states of matter at the same temperature

Explanation

When we supply heat energy to ice, its temperature increases till it reaches 0°C but continues to be ice only. On further supply of heat energy, there is no rise in temperature but ice converts into water at same `0^@C` temperature. Heat supplied is used for phase transfor mation (state change) only. Similarly, water at `100^@C` on supplying heat energy converts into steam without any change in temperature. The heat absorbed is utilized only to change the state of matter from liquid state to gaseous state. Hence, ice and water exist in contact at `0^@C` and water and steam exist in contact at `100^@C`.