Question

For convection to occur,

A. dark objects are required to absorb energy.
B. substances must be in contact with each other.
C. particles must be able to flow within a substance.
D. heat must transfer from an area of less energy to more energy.

Answer 1

C. Convection is the transfer of energy by the motion of a fluid. Fluids are by definition substances in which particles are able to flow. Hence the answer is c