Vacuum
Vacuum
Vacacuum (/ˈvækjuːm, ˈvɑːk-/), from the Latin vacuus meaning "empty", is a space devoid of matter. The word stems from the Latin adjective vacuus for "vacant" or "void". An approximation to such vacuum is a region with a gaseous pressure much less than atmospheric pressure.
Definition
In the physics context, vacuum is referred to as a space that is empty of matter, so that gaseous pressure is much less than standard atmospheric pressure. The word vacuum comes from Latin, meaning 'an empty space, void', noun use of neuter of vacuus, meaning "empty", related to vacare, meaning "be empty".
Types of Vacuum
Vacuum can be categorized into different types based on the volume of the space and the amount of matter left in it. These include:
- Perfect Vacuum - A perfect vacuum, also known as a torricellian vacuum, is a vacuum that contains no particles.
- Partial Vacuum - A partial vacuum is a vacuum with low amounts of matter compared to an atmospheric pressure.
- High Vacuum - A high vacuum is a vacuum where the pressure is low enough that the mean free path of particles is long enough to affect the properties of the vacuum.
Applications
Vacuum has numerous applications in the fields of science, technology, and engineering. These include:
- Vacuum Cleaner - A vacuum cleaner is a device that uses an air pump to create a partial vacuum to suck up dust and dirt.
- Vacuum Tube - A vacuum tube is a device controlling electric current through a vacuum in a sealed container.
- Vacuum Flask - A vacuum flask is an insulating storage vessel that greatly lengthens the time over which its contents remain hotter or cooler than the flask's surroundings.
See Also
External links
- Medical encyclopedia article on Vacuum
- Wikipedia's article - Vacuum
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