In this way energy is transferred from one form and source to another.

In order to heat or cool a mass of something, energy must be transferred.

However, energy can be transferred from one part of the universe to another.

In physics, work is the amount of energy transferred by a force.

For a closed system, heat and work are the mechanisms by which energy can be transferred.

The amount of energy transferred in this way is written q.

This energy is not obviously transferred to any other system, so seems to be permanently lost.

The energy transferred by a wave in a given time is called its intensity.

If there is no air flow around the heat sink, energy cannot be transferred.

This energy may also be transferred throughout the material: absorption.