The thermos consists of two flasks, from the space between which air is pumped out. Explain why the air is pumped out.

The thermos consists of two flasks, from the space between which air is pumped out. Explain why the air is pumped out. Will a thermos keep cold as well as warm?

The thin air between the flasks reduces thermal conductivity between the walls of the thermos and the environment, so the thermos retains cold as well as heat.

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