Question

how do you know that some entity is a form of energy?

Answer 1

• Energy is considered as the capability to perform work

• Heat is another form of energy that can be used for thermal uses purposes.

In other words, heat is used to increase the temperature by many notches

• Similarly the sound energy is used to create noise and if the energy is high, the sound would be audible to the ears.

Answer 2

If something is capable of doing work then that entity is assumed to have energy be it in any form. For example a heat is a form of energy which makes the air particles move. Similarly sound is a form of energy which makes them vibrate.