Outer space is an even higher-quality vacuum, with the equivalent of just a few hydrogen atoms per cubic meter on average in intergalactic space. Ultra-high vacuum chambers, common in chemistry, physics, and engineering, operate below one trillionth (10 −12) of atmospheric pressure (100 nPa), and can reach around 100 particles/cm 3. For example, a typical vacuum cleaner produces enough suction to reduce air pressure by around 20%. Other things equal, lower gas pressure means higher-quality vacuum. The quality of a partial vacuum refers to how closely it approaches a perfect vacuum. The Latin term in vacuo is used to describe an object that is surrounded by a vacuum. In engineering and applied physics on the other hand, vacuum refers to any space in which the pressure is considerably lower than atmospheric pressure.
#Deepvacuum free#
Physicists often discuss ideal test results that would occur in a perfect vacuum, which they sometimes simply call "vacuum" or free space, and use the term partial vacuum to refer to an actual imperfect vacuum as one might have in a laboratory or in space. An approximation to such vacuum is a region with a gaseous pressure much less than atmospheric pressure.
The word is derived from the Latin adjective vacuus for "vacant" or " void".
0 kommentar(er)
