Thermal Properties of Matter

Gravitational force is required for

1. stirring of liquid
2. convection
3. conduction
4. radiation

Answer

(2) convection

Solution

In convection, the heated part of a fluid becomes less dense and rises while the denser, colder part sinks.

This rising and sinking is due to buoyancy, which exists only because of gravity.

Natural convection needs gravitational force; conduction and radiation do not.

Answer: (2)