What absolute pressure does a thermos lining have?

[Plasmech]

Title says it all. What absolute pressure is attained in a Thermos (TM) vacuum jacket?

-Plasmech

Mechanical Engineer, Plastics Industry

 

[MintJulep]

Well, according to

http://www.popedewars.com/labgrade.html

laboratory Dewar flasks are in the neighborhood of 10[sup]-5[/sup]torr

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[sup]-3[/sup]torr. I'd imagine a Thermos is in that range.

 

[25362]

From Google:

maximum pressure of a thermos bottle lining: 0.001 torr
typical: 10[sup]-6[/sup] torr.