Social Sciences, asked by pavandolas1714, 1 day ago

bob
why are thermos flaskb used ?

Answers

Answered by ankitavhane2
0

Answer:

a thermos flask or a vacuum flask is used to keep a hot liquid hot and cold liquid cold for a long time,by preventing the loss or gain of heat energy due to conduction, convection and radiation. it was invested by sir james Dewar in 1892.

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