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Question

It is hotter for the same distance over the top of the fire than it is by the side is mainly because
  1. air conducts heat upwards.
  2. heat is radiated upwards.
  3. convection, conduction and radiation all contribute significantly in transferring heat upwards.
  4. convection takes more heat upwards.

A
heat is radiated upwards.
B
convection takes more heat upwards.
C
convection, conduction and radiation all contribute significantly in transferring heat upwards.
D
air conducts heat upwards.
Solution
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Convection phenomena transfers heat due to the motion of medium particles as advection is a major part of convection.

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