Name the S.I. unit of heat and how is it related to the unit calorie?
What is heat ? Write its S.I. unit.
Two bodies at different temperatures are placed in contact. State the direction in which the heat will flow.
Define temperature and write its S.I. unit.
Why does a piece of ice when touched with hand , appear cool ? Explain .
Distinguish between heat and temperature.
Name two substances which expands on heating.
Name two substances which contract on heating.