- #1
Squires
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Okay, so firstly sorry if this is a poor post/wrong topic, I'm kind of new here, and it's been a while!
I'm given an example of a quasistatic process, in a frictionless piston. The piston compresses an ideal gas from Vi to Vf, and pressure increases from Pi to Pf, all at a constant temperature.
I've calculated the final pressure, work done etc, but I'm now asked to calculate the internal energy of the gas(ideal), and then the heat flow into the system, and I'm getting confused.
Attempted solutions:
Obviously if the temperature is constant, then heat transferred(Q) to the system is 0, and so heat flow in must equal heat flow out surely?
so from the first law of thermodynamics, the change in U(int energy)=Q+W(workdone),
so the change in internal energy is equal to work done? But then how do I calculate the heat flow into the system?? I don't think its 0, because I require the heat flow in the next question, which is to calculate the entropy change, which is just deltaQ/Temperature if I'm correct?
Thanks for reading, sorry if it came across hard to understand what I'm trying to say, explaining science is definitely not my forté :S
I'm given an example of a quasistatic process, in a frictionless piston. The piston compresses an ideal gas from Vi to Vf, and pressure increases from Pi to Pf, all at a constant temperature.
I've calculated the final pressure, work done etc, but I'm now asked to calculate the internal energy of the gas(ideal), and then the heat flow into the system, and I'm getting confused.
Attempted solutions:
Obviously if the temperature is constant, then heat transferred(Q) to the system is 0, and so heat flow in must equal heat flow out surely?
so from the first law of thermodynamics, the change in U(int energy)=Q+W(workdone),
so the change in internal energy is equal to work done? But then how do I calculate the heat flow into the system?? I don't think its 0, because I require the heat flow in the next question, which is to calculate the entropy change, which is just deltaQ/Temperature if I'm correct?
Thanks for reading, sorry if it came across hard to understand what I'm trying to say, explaining science is definitely not my forté :S
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