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1)WHAT IS A VACCUM
2)I HAVE HEARD THERE IS A HIGH VACUUM AND A LOW VACUUM.
WHAT IS THE DIFFERENT.
3)HOW TO CREATE A HIGH AND LOW VACUUM
Vacuum is actually a poor word sometimes. A vacuum is actually a place with less air than elsewhere. For instance, there is no air in outer space, so we call it a vacuum.
The important thing to know is how much less air there is inside the vacuum. Thatís where the words Low and High come in. Low vacuum is around 10^-4 times the atmosphere. High vacuum is 10^-8 atmospheres. There is even Ultra-High vacuum that is around 10^-12 atmospheres. So when you say something has higher vacuum, itís the same as saying that there is less air inside.
To get a vacuum, first you need a chamber that wonít let air leak back in or be crushed by the air that's outside when there is none inside. Then, you need a special pump that will pump the air out. The more leak-proof you can make the pump and the chamber, the higher level of vacuum you can get.
(republished on 08/02/06)
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