My university has a sputtering machine which is this crazy expensive piece of equipment that has to have a really strong vacuum pump and wacky copper seals and if it loses power for even a minute it has to spend 16 hours pumping it’s vacuum back down.
I know people talk about how a perfect vacuum is like near impossible, but why? We can pressurize things really easily, like air soft co2 canisters or compressed air, which is way above 1 atmosphere in pressure, so why is going below 1 atmosphere so hard? I feel dumb asking this as a senior mechanical engineering student but like I have no clue lol.
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Imagine a warehouse, filled to the brim with glitter. A lot of the glitter is pretty easy to remove, but there will always be some glitter particles left somewhere.
A perfect vacuum is the same, it is incredibly hard to remove all the molecules in the air, to do a perfect vacuum
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