Quote Originally Posted by Spedley View Post
I read that and I'm not sure what an 'ultra-high' vacuum is? :-) Surely you can't get any more vacuous than a vacuum unless it has some extra 'nothing' in it!
Most plastic "gas" and getting a full vacuum or close to full is (apparently) a tough nut to crack.

I guess with a syringe it is possible to put a bit of hydraulic oil in it then evacuate all the bubbles put your finger over the end and pull a full vacuum.... I reckon with a larger vacuum chamber it gets a bit like the frog trying to cross the road by only jumping half of the distance remaining.... it never quite makes it across to the other side :)
as the pressure drops there is less and less to remove.... at what point is there one gas atom left and how does the pump get the lousy fooooker out lol