Question

A hot liquid kept in a thermos is an example of which type of system.

Answer 1

It is an example of an Isolated system where there is no exchange of heat as well as matter. But as we know, no perfect isolated system is possible as we find that only some days we can keep the liquid hot.

Answer 2

Answer:

A hot liquid kept in a thermos is an example of both an isolated and adiabatic system.

Explanation:

• In the system of hot liquid kept in thermos flasks, neither heat nor mass transfer occurs.
• The following is the statement in terms of expressions:

                        $dm=0$

                       $dE=0$

This represents an isolated system.

• The heat inside the system of hot liquid kept in thermos flasks remains constant.

                           $dQ=constant$

This is an adiabatic system.

A hot liquid kept in a thermos is an example of both an isolated and adiabatic system.

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