## What is the definition of energy?

## What do we use energy for?

- We use
**energy**to run, to make things happen. I know, all the school books say**energy is**the ability to do work. But what does that mean? Well it sort of means the ability to make something happen (the nearly-well-known Dave Watson definition).

## What is the definition of energy in quantum mechanics?

- In quantum mechanics, energy is defined in terms of the energy operator as a time derivative of the wave function. The Schrödinger equation equates the energy operator to the full energy of a particle or a system. Its results can be considered as a definition of measurement of energy in quantum mechanics.

## What is the definition of thermal energy in physics?

- Thermal Energy – Definition. Thermal energy (also called the internal energy) is defined as the energy associated with microscopic forms of energy. Thermal Engineering In thermodynamics, thermal energy (also called the internal energy) is defined as the energy associated with microscopic forms of energy.

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