Question

which method of heat transfer is the transfer of heat through a liquid or gas?
convection
reflection
conduction
radiation

Explanation:

Convection is the heat - transfer method in fluids (liquids and gases) due to the bulk movement of molecules. Reflection is related to light and not heat transfer in this context. Conduction is heat transfer through solids or stationary fluids by molecular collisions. Radiation is heat transfer through electromagnetic waves and does not require a medium.

Answer:

convection