Question

A liquid remains hot or cold for a long time in thermos flask because there is no loss or gain of heat by

Answer 1

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A liquid remains hot or cold for a long time in thermos flask because there is no loss or gain of heat by the liquid and the flask.

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Answer 2

A liquid remains hot or cold for a long time in thermos flask because there is no loss or gain of heat by the system and surrounding.

Explanation:

A thermos flask is a closed vessel in which there occurs no exchange of energy either with the system or surrounding. Therefore, when a liquid is kept in a thermos flask then it is able to remain hot or cold for a long times as there is no loss or gain of heat by the system and surrounding.

Whereas in an open system there will occur exchange of energy between both the system and surrounding.

Read more about closed system:

https://brainly.in/question/4814694

https://brainly.in/question/1819808

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