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Michelle Steinberg2J
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Joined: Fri Sep 29, 2017 7:04 am


Postby Michelle Steinberg2J » Sat Jan 20, 2018 4:20 pm

Can someone please explain why mercury in a thermometer is a closed system?

Andres Reynoso 1J
Posts: 30
Joined: Fri Sep 29, 2017 7:06 am

Re: HW #1 PART E

Postby Andres Reynoso 1J » Sat Jan 20, 2018 4:26 pm

Mercury in a thermometer is a closed system because only energy can be exchanged with its surroundings. Matter cannot be exchanged within the system.

Here is a more detailed example for the thermometer's case:
A thermometer is placed under someone's tongue. The heat (energy) from their body (surroundings) is transferred to the thermometer (system). The volume of the mercury expands, but no mercury or any other substance (matter) enters or leaves the system.)
Last edited by Andres Reynoso 1J on Sat Jan 20, 2018 4:45 pm, edited 1 time in total.

Thuy-Anh Bui 1I
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Joined: Sat Jul 22, 2017 3:00 am
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Re: HW #1 PART E

Postby Thuy-Anh Bui 1I » Sat Jan 20, 2018 4:30 pm

A closed system is one that can exchange energy but not matter with the surroundings. Mercury in a thermometer exchanges energy with its surroundings to rise and fall in the tube and indicate the temperature, but it does not leak and exchange matter. Hope this helps!

Ashley Macabasco 2K
Posts: 30
Joined: Fri Sep 29, 2017 7:05 am

Re: HW #1 PART E

Postby Ashley Macabasco 2K » Sat Jan 20, 2018 4:47 pm

Mercury in a thermometer is an example of a closed system because the mercury itself is unable to leave the thermometer, but its energy is able to be exchanged with its surroundings (energy seen as heat). The transfer of heat is what makes the mercury leave in a thermometer rise or drop with heat causing mercury to rise. If it were an open system, then the amount of mercury itself would be able to escape out of the thermometer and if it were an isolated system then no heat would be able to reach the system.

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