Heat flow is a quantity of heat transfer.

Heat flow is a quantity of heat transfer

a. within definite time
b. within definite cross-sectional area
c. within definite volume of the system
d. one of the above

Correct Answer : a. within definite time

Explanation :

The direction of the heat transfer takes place from a body with higher temperature to a body with lower temperature. The heat transfer takes place through all directions of the system with different rates of heat transfer. Heat transfer with a certain rate is a heat flow. Heat flow can be defined as a quantity of heat transfer within definite time. Q is the symbol of heat flow. If heat flows into a system then it is considered positive and if heat flows out of the system then it is considered as negative.