Describe: How can air be used as an energy source?

Energy is the ability of a system to do work, and can also say that work and energy are equivalent concepts, although the scope and content of those two words are not dedicated. In essence, to change the energy is equal to the performed joy, and therefore to express the same measurement of the unit - joule [J] in the part of the English physicist James Prescott Joule. Doing work can be manifested in many ways: as a change of position, speed, temperature, etc.

Because wind is also an energy source in the world

Explanation:

They use windmills for energy