Question

Why vaccum flask can keep drink cold as well as hot

Answer 1

hlo mate......

Vacuum flasks are a bit like people in this respect: they like to keep things at steady temperatures. If you put hot drinks in them, they keep them hot; if you put cold drinks in them, they keep them cool

hope it help you

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Answer 2

Explanation:

to keep ur drinks hot and cold it minimizes heat transfer due to conduction and radiation .convection is not included becoz convection keeps the temprature in a liqied wven