# Convection

Written by Jerry Ratzlaff. Posted in Thermodynamics

Convection is the transfer of heat by air, water, or any other substance that passes over an object, the surface having a higher temperature than the one passing over it.

• Abbreviated as CONVN

## formula

$$Q = h A \left( T_h \;-\; T_c \right)$$

Where:

$$Q$$ = heat transfer

$$h$$ = heat transfer coefficient

$$A$$ = cross sectional area

$$T_h$$ = higher temperature

$$T_c$$ = cooler temperature