What absolute pressure does a thermos lining have?
What absolute pressure does a thermos lining have?
(OP)
Title says it all. What absolute pressure is attained in a Thermos (TM) vacuum jacket?
-Plasmech
Mechanical Engineer, Plastics Industry





RE: What absolute pressure does a thermos lining have?
laboratory Dewar flasks are in the neighborhood of 10-5torr
I suspect that a run-of-the-mill Thermos for keeping your soup hot wouldn't bother to have such a good vacuum - a diffusion pump is needed to get down that low.
A decent mechanical vacuum pump could probably pull something like 10-3torr. I'd imagine a Thermos is in that range.
RE: What absolute pressure does a thermos lining have?
From Google:
maximum pressure of a thermos bottle lining: 0.001 torr
typical: 10-6 torr.