Heat is the transfer of thermal energy from one object to another because of a difference inspecific heatphase temperature waste heat

temperature

Explanation:

For any transfer of heat energy from one system to other it always requires temperature gradient.

So here we can say that when two bodies are at different temperatures then the Heat is transferred from one object at high temperature to other object at lower temperature.

The transfer of energy is of dynamic type in which if two bodies comes to same temperature then heat given by one body to other body is equal in magnitude to the heat given by other body.

So here if the temperature of two objects are equal then in that case the net thermal energy transferred will be zero.

So here correct answer would be TEMPERATURE

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.