What is a vacuum physics simple definition?
vacuum, space in which there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there. It is a condition well below normal atmospheric pressure and is measured in units of pressure (the pascal).
What is vacuum energy in physics?
Vacuum energy is an underlying background energy that exists in space throughout the entire Universe. The vacuum energy is a special case of zero-point energy that relates to the quantum vacuum. Unsolved problem in physics: Why does the zero-point energy of the vacuum not cause a large cosmological constant?
What is a vacuum Theorem?
Superfluid vacuum theory (SVT), sometimes known as the BEC vacuum theory, is an approach in theoretical physics and quantum mechanics where the fundamental physical vacuum (non-removable background) is viewed as superfluid or as a Bose–Einstein condensate (BEC).
How does vacuum occur?
In general, a vacuum is created by starting with air at atmospheric pressure within a chamber of some sort. At atmospheric pressure, the gas molecules are very close together; and as they are in constant motion, the distance between molecule-to-molecule collisions is very short.
What is vacuum and its examples?
A vacuum cleaner. The definition of a vacuum is a space devoid of air or matter, or a tool that uses suction to clean. An example of a vacuum is a space with nothing in it. An example of a vacuum is something used to clean up dirt on a floor.
What is vacuum energy level?
In physics, the vacuum level refers to the energy of a free stationary electron that is outside of any material (it is in a perfect vacuum). It may be taken as infinitely far away from a solid, or, defined to be near a surface.
How is vacuum produced?
In general, a vacuum is created by starting with air at atmospheric pressure within a chamber of some sort. As molecules are removed, there are fewer other molecules for a given molecule to collide with the distance becomes longer and longer as the pressure is reduced.
How do you calculate vacuum?
The vacuum level is the difference in pressure between atmospheric pressure and pressure in the evacuated system:
- 0\% vacuum = 760 torr = 14.7 psia = 29.92 inc mercury abs = 101.4 kPa abs.
- 50\% vacuum = 380 torr = 7.3 psia = 15 inc mercury abs = 50.8 kPa abs.