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1. Explain the working of thermos flask.
The thermos flask or vacuum flask is an that its content than the environment (surroundings) over a period of time. It is primarily meant to of a liquid by and avoiding the possibility of getting a bad taste.
A thermos flask has , which are evacuated, and it is silver coated on the inside of the vacuum bottle. The vacuum between the two walls heat from being conveyed from the inside to the outside by conduction and convection. There is almost from the inner wall to the outer wall with between the walls or vice versa. can only happen at the points where the two walls meet, at the top of the bottle, and through insulated support at the bottom. The silvered walls reflect radiated heat back to the liquid in the bottle, the same way a space blanket does.
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