Constant temperature

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Mishta Stanislaus 1H
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Joined: Fri Sep 29, 2017 7:04 am

Constant temperature

Postby Mishta Stanislaus 1H » Sun Jan 14, 2018 4:26 pm

During a phase change, say from solid to liquid, why does the temperature remain constant and not increase?

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Re: Constant temperature

Postby Sungyoon_Baek_1A » Sun Jan 14, 2018 4:44 pm

The temperature does not change during a phase change because the heat being added or taken away (in the case of solid to liquid; added) is being used to break the forces (hydrogen bond, etc.) between the molecules rather than increasing the average kinetic energy of the molecules (the average kinetic energy is what temperature is in reference to)

Vasiliki G Dis1C
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Joined: Fri Sep 29, 2017 7:04 am

Re: Constant temperature

Postby Vasiliki G Dis1C » Sun Jan 14, 2018 4:45 pm

Let's say we are talking about the process of melting. Once we hit the melting point of the substance, the molecules gain enough energy to move past one another rather than being locked in a solid form. All the added energy at this temperature is being used to overcome the attractive forces between molecules. So, while the heating is continuing, the temperature remains the same until the entire substance has melted. Hope this helps!

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Re: Constant temperature

Postby AnuPanneerselvam1H » Sun Jan 14, 2018 7:28 pm

Temperature stays constant during a phase change because the heat is being used to break/make bonds between the molecules.

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