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Madison Hurst
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Postby Madison Hurst » Mon Feb 04, 2019 12:59 am

Why is a thermos considered an isolated system and not a closed system?

Posts: 68
Joined: Fri Sep 28, 2018 12:26 am

Re: Thermos

Postby armintaheri » Mon Feb 04, 2019 1:42 am

A closed system allows energy to leave and enter, but not matter. An isolated system allows neither energy nor matter to leave and enter. In reality, a thermos is a closed system because it does allow for the exchange of small amounts of energy (A hot drink eventually cools down in a thermos). But the ideal thermos would be an isolated system since it wouldn't allow energy to leave or enter.

Catly Do 2E
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Joined: Fri Sep 28, 2018 12:24 am

Re: Thermos

Postby Catly Do 2E » Mon Feb 04, 2019 2:05 am

A thermos is technically an isolated system because there is no exchange of matter or energy between the system (thermos) and surroundings. However, a cold or hot drink in the thermos will eventually get to room temperature. It's very difficult to achieve and build a true, isolated system, but the thermos is still considered one because it hinders matter/energy flow.

Sarah Fatkin 4I
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Re: Thermos

Postby Sarah Fatkin 4I » Mon Feb 04, 2019 10:08 am

A really good thermos that does not let any heat in or out is considered an isolated system, because neither matter nor energy can be inputted into the system. Hope this helps!

Charles Gu 1D
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Re: Thermos

Postby Charles Gu 1D » Fri Feb 08, 2019 8:05 pm

Closed systems allow energy to be exchanged with the surroundings. A thermos, therefore, keeps the liquid inside from interacting with its surroundings and does not allow matter to escape either so it is isolated.

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