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What is vacuum?

What is vacuum?

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Gas molecule speed d<strong>is</strong>tribution<br />

P<br />

Derived from kinetic gas theory<br />

() v<br />

⎡<br />

= 4π<br />

⎢<br />

⎣<br />

m<br />

2πkT<br />

⎤<br />

⎥<br />

⎦<br />

3<br />

2<br />

v<br />

2<br />

e<br />

−mv<br />

v = gas molecule speed<br />

m = gas molecule mass<br />

k = Boltzmann’s constant<br />

2<br />

2kT

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