Boiling Point

Q.

A substance is said to be in the liquid state if under normal pressure its

1. melting point is above the room temperature.

2. boiling point is below the room temperature.

3. melting point is below the room temperature.

4. boiling point is above the room temperature.

Q.

A substance will exist in the liquid state only below its ______________

1. Freezing point

2. All the above

3. Boiling point

4. Melting point

Q.

Define boiling

Q.

Under which of the following conditions we can boil water at room temperature?

1. By adding any salt.

2. By increasing the pressure.

3. By lowering the pressure.

4. By adding any liquid.

Q.

Food is cooked quickly in a pressure cooker. Explain.

Q.

If cold water is poured on a flask containing very hot distilled water and water vapour, the water inside the flask started to boil below ${100}^{\mathrm{o}}\mathrm{C}$. The principle involved is ________.