A block of wood is floating on water at 0^(@)C with a certain volume 'V' above the water level. The temperature of water is slowly raised to 20^(@)C . How does the volume 'V' change with the rise in temperature ?

A block of wood is floating on water at 0^(@)C with a certain volume '

1.	A block of wood is floating on water at 0^(@)C with a certain volume 'V' above the water level. The temperature of water is slowly raised to 20^(@)C . How does the volume 'V' change with the rise in temperature ?
Answer» remain unchanged decrease continuously decrease till `4^(@)C` and then INCREASE. increase till `4^(@)C` and then decrease. Solution :The density of water INCREASES from `0^(@)` to `4^(@)C` and then decreases. THEREFORE, the volume V of the block above water level will increase till `4^(@)C` and then decrease.