Question

In the expression \[\frac{dQ}{dt}=-kA\frac{dT}{dx}\]​, what does the magnitude of the temperature gradient \[|\frac{dT}{dx}|\]​​ represent?

Options

• Rate of heat change with time

• Total temperature difference of the rod

• Average temperature of the rod

• Temperature change per unit length

Answer 1

Temperature change per unit length

Explanation:

The temperature gradient represents how much temperature changes per unit distance along the material.