Write down the approximate range of temperature at which water boils in a pressure cooker.

Complete the following sentences:

1. When ice melts, it's volume ……………
2. Decrease in pressure over ice …………… it's melting point.
3. Increase in pressure …………… the boiling point of water.
4. A pressure cooker is based on the principle that boiling point of water increases with the ……………
5. The boiling point of water is defined as ……………
6. Water can be made to boil at 115°C by …………… pressure over it's surface.

1 g ice at 0° C melts to form 1 g water at 0° C. State whether the latent heat is absorbed or given out by ice.

A substance on heating undergoes (i) a rise in it's temperature, (ii) a change in it's phase without change in it's temperature. In each case, state the change in energy of molecules of the substance.