No system is completely closed off from its surroundings. Which represents a system that is almost completely closed?

A.

a pot of boiling water

B.

a washing machine

C.

a capped soda bottle

D.

a wood-burning fireplace

I think the correct answer from the choices listed above is option A. It would be a pot of boiling water that represents a system that is almost completely closed since there is no mass flow and there is a very minimal heat transfer. Hope this answers the question.