Question

50 points
why change of state take place?​

Answer 1

Heat is probably the easiest energy you can use to change your physical state. The atoms in a liquid have more energy than the atoms in a solid. There is a special temperature for every substance called the melting point. ... Liquid water freezes and becomes solid ice when the molecules lose energy.

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Answer 2

☺hey mate, ✌

Why does the change of state take place at constant temperature?

1 ANSWER

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Answered Nov 8, 2018

A state is condition of a system and is specified by its properties. That's why state change means properties of system change. Properties of Thermodynamics system is Temperature, Pressure, volume, density, etc.

If one of the above properties (Temperature, pressure, volume) change it means state of system change. If you want to change the state of system without changing temperature, then you have to change other properties like pressure, Volume.

You can see in isothermal process. In this process state of system change at constant temperature

Take one example

Take one pistan and cylinder, and fill gases inside the cylinder. Now supply heat slowly to the system(arrangement of pistan and cylinder). If you want to keep temperature constant then you have to expand the system boundary. Because expansion decrease temperature and compression increase temperature.

In this case you are supply heat to the system that's why you have to expand system boundary to keep temperature constant, and in this case volume of system change by expansion. It means state of system change

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