Question

3. Give reasons:
a) Mercury is used in thermometer.
b) Cold water kept in an open container become warm on a hot summer afternoon

Answer 1

Why does cold water kept in an open container become warm on a hot summer afternoon? Cold water kept in an open container acquires heat from the warmer surrounding air on a hot summer afternoon. As a result cold water will become as warm as the air around it due to transfer of thermal energy.