temperature difference
temperature gradient
isotherm
None of the above
Answer is Wrong!
Answer is Right!
The correct answer is: B. temperature gradient.
A temperature gradient is the rate of change of temperature with respect to distance. It is a vector quantity, with both magnitude and direction. The magnitude of the temperature gradient is the change in temperature divided by the distance over which the change occurs. The direction of the temperature gradient is from hot to cold.
A temperature difference is the difference between two temperatures. It is a scalar quantity, with no direction.
An isotherm is a line on a map or graph that connects points of equal temperature. It is a curve, not a vector quantity.
None of the above is the rate at change of temperature.