Which one of the following statements with regarding to expansion of materials due to heating is not...........

General Science (NDA) Physics

Download Solution PDF

Which one of the following statements with regarding to expansion of materials due to heating is not correct?

As ice melts, it expands uniformly up to 4°C.

Mercury thermometer works using the principle of expansion due to heating.

Small gap is kept between two rails to allow for expansion due to heating.

The length of metallic wire increases when its temperature is increased.

Explanation:

Generally substances expand on heating and contract on cooling. Now, if temperature of certain amount of water is increased from 0°C to 100°C, its volume decreases between 0°C (ice) to 4°C and increases from 4°C to 100°C. Therefore during 0°C to 4°C, anomalous
behaviour of water is observed.