Question

The phenomenon due to which particles of a medium actually move to the source of heat is called:

• A. radiation
• B. conduction
• C. convection
• D. none of the above

Answer 1

The correct option is C

convection

(C): Convection

1. The phenomenon due to which particles of a medium actually move to the source of heat energy, and on absorbing heat energy move away from it thereby making space for other particles to move to the source of heat energy, is called convection.
2. Convection can take place in liquids and gases only, where the particles are free to move about.
3. The exception is mercury which gets heated by conduction.

Hence, the correct answer is an option (C): Convection.