Question

Which of the following statements is true about convection?

• A. In solids, heat is transferred only by convection.
• B. Convection occurs only in cold liquids.
• C. Convection requires a medium for transmission of heat.
• D. Heat flows from the cold end to the hot end in a substance.

Answer 1

The correct option is C Convection requires a medium for transmission of heat.

Convection primarily occur in fluids. Convection occurs by the movement of particles from high temperature to low temperature. For example, while heating water, the lowest layer gains heat and rises up. Cold water rushes to occupy its place and this way the whole water is heated.