I'm now curious.What then prevents the outer skin collapsing towards the inner skin when subjected to the pressure applied by the depth of the sump + 1 bar since there is a vacuum inside the outer skin?Maj.
A lot of thermos flasks have a layer of silvered glass either side of the vacuum as it's a poor conductor of heat - rather than metal. I'd guess that the glass would have to smash first before the surface shows any deformation - whereas a metal one could bend under the compression forces. The flask obviously must be designed to be strong enough to withstand the internal vacuum without the glass breaking - and no doubt will have a decent margin over that.
Flasks are usually cylindrical,making them pretty good at resisting pressure from the outside -think of a submarine's pressure hull. The ends will be the weak points.
There was a container of rubber ducks that fell off a ship years back and the dispersion of the ducks has yielded huge quantities of data on ocean currents. They were distributed most of the way round the world!
QuoteWhoever leaves teabags in the flask needs a lesson on how to make decent flask tea!Suppose that could be the subject of a workshop at the next Hidden Earth. Surely leaving the tea bag in the flask would render it rather stewy? Would a more fuller flavour tea such as Assam be better than say a lighter green tea in an adverse environment?
Whoever leaves teabags in the flask needs a lesson on how to make decent flask tea!
Making tea in a flask is a skill I have yet to master.
... we shall vote on a new name, The "Tea and Soup Group"
Quote from: Ian Ball on December 05, 2017, 07:07:17 pmMaking tea in a flask is a skill I have yet to master. flask of boiling water and add a teabag/tea to the cup
Quote ... we shall vote on a new name, The "Tea and Soup Group"Hmmm... Tea & Soup Group = TSG. Always thought the TSG didn't really mean the Technical Speleological Group
...Tea & Pb Users..
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