Question

Identify the type of thermodynamic system in
each of the following cases :
(i) A sealed bottle of flavoured milk
(ii) Ice in a closed thermos flask

Answer 1

Solution.

(i)

A sealed bottle of flavored milk is a closed system, since it is separated from the environment only by a layer of plastic. In this system there is an exchange of energy, but there is no exchange of matter.

(ii)

Ice in a closed thermos is an isolated system, since ice is separated from the environment by a layer from a thermos and empty space. Neither energy nor matter exchanges with the environment.

Answer:

(i)

Closed system

(ii)

Isolated system