Thermodynamics: Understanding Isobaric Processes

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In thermodynamics, processes at constant pressure allow for volume changes primarily through temperature variations. A common example is a balloon, where heating the air inside causes it to expand while maintaining nearly constant pressure. This principle can also be applied to atmospheric modeling, illustrating how temperature affects volume without altering pressure. In engines, heat supplied to a chamber can drive a piston under constant external load, demonstrating practical applications of this concept. Understanding these scenarios clarifies how temperature influences volume in constant pressure systems.
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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.
 
mfb said:
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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