What is a Vacum fluctuacion?

Question

What is a Vacum fluctuacion?

Answer 1

It is spelt VACUUM...  two u's...plus, I have no idea

Answer 2

In classical physics, energy is always conserved. But in the microworld of Quantum Mechanics, energy can appear and disappear out of nowhere. This is called the uncertainty principle of Heisenberg.

It implies that energy can be borrowed as it were, for a short time, to create particle pairs. In effect, they are created from uncertainties in energy. These uncertainties exist because QM forbids the simultaneous measurement of coupled variables like energy and time.

Since these particles do not have a permanent existence, they are called virtual particles and the phenomenon is called vacuum fluctuation.

The effect is very real and measurable. Even though we can't see those particles, we know that these virtual particles exist in empty space because they leave detectable traces. One effect of virtual photons, for example, is to produce a tiny shift in the energy levels of atoms.  These minute but significant alterations have been very accurately measured using spectroscopic techniques.