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when toggle format what by license comment
Nov 27, 2018 at 19:26 comment added user608672 So metal heats up easily...but reflects infrared...which is often a means of transmitting heat. Something isn't adding up here.
Nov 27, 2018 at 4:35 comment added safesphere You may want to add to the answer that a vacuum inside means a very strong atmospheric pressure on the walls. A container made of a softer material would be crushed by the pressure. Also the reason why a metal is used is that it reflects infrared like a mirror.
Nov 26, 2018 at 17:39 history answered joshuaronis CC BY-SA 4.0