- #1
kyrani99
- 7
- 0
Can someone tell me if there is a definition for energy. I don't mean a type of energy such as kinetic or potential etc. We talk about empty space having energy but what is it? Thanks
Drakkith said:You need to look at vacuum energy from the perspective of Quantum Field Theory. In QFT and related theories, particles are simply excitations of underlying fields. These fields have quantized energy values and, as all quantum systems, have a ground state with a finite amount of energy.
http://en.wikipedia.org/wiki/Vacuum_energy
One could say that the claim "remove all of what exists in space" to be impossible since particles and fields are effectively two forms of the same thing.
Energy is the ability to do work or cause change. It is a fundamental concept in physics and is measured in units such as joules or calories.
Energy is classified into two main types: potential energy and kinetic energy. Potential energy is stored energy that an object has due to its position or state, while kinetic energy is the energy an object possesses due to its motion.
There are various forms of energy, including mechanical energy, thermal energy, electromagnetic energy, chemical energy, nuclear energy, and more. All of these forms can be converted into one another.
The law of conservation of energy states that energy cannot be created or destroyed, only transferred or transformed from one form to another. This means that the total amount of energy in a closed system remains constant.
Energy is measured using various units, depending on the type of energy being measured. For example, mechanical energy is measured in joules, while thermal energy is measured in calories or joules. The SI unit for energy is the joule (J).