Question

Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations.

A glass tumbler containing hot water is kept in the freezer compartment of a refrigerator (temperature < 0°C). If you could measure the temperature of the content of the tumbler, which of the following graphs (Fig.1.2) would correctly represent the change in its temperature as a function of time.

Conversion of solid to vapour is called sublimation. Name the term used to denote the conversion of vapour to solid.

Conversion of solid state to liquid state is called fusion; what is meant by latent heat of fusion?