Zero-point energy is the energy of a system when it is at its lowest energy state. The reason for the energy can be explained with the uncertainty principle. Every system obeys the uncertainty principle, which is when the position of a system is known, the momentum of the system cannot be known for sure, and vice versa. So at its lower energy state or the ground state, the system should have a minimum energy to satisfy this principle. That energy is the zero-point energy.
Frequently Asked Questionsedit
Is it possible to draw the zero-point energy out of the system?edit
No. This would violate the uncertainty principle and thermodynamic laws. Therefore, such a system is impossible to exist in the universe.