Isobaric processes

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Hello.I'm studying thermodynamics and i'm having trouble understanding processes where the pressure is constant.How can temperature alone modify the volume without doing pressure.An example would be appreciated.Thanks.
 

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Usually, systems with constant pressure are at atmospheric pressure and have some way to change their volume. Look at a balloon, for example: If you heat the air inside, it will expand, while the pressure is (nearly) constant.
 
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haruspex
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Usually, systems with constant pressure are at atmospheric pressure and have some way to change their volume. Look at a balloon, for example: If you heat the air inside, it will expand, while the pressure is (nearly) constant.
You can also take away the balloon and use it in modelling atmospheric changes.
In an engine, you could supply heat to a chamber to drive a piston that's subject to constant external load over some part of the cycle.
 

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