Isobaric System (work done by, or on?)

• audilover
In summary, for the given graph of PxV where pressure is constant and volume increases from point A (1) to point B (3.5), the problem asks if work is being done on or by the system. The equation U=Q-W is provided. The attempt at a solution suggests that work is being done on the system, but it is clarified that the sign of W determines whether work is being done on or by the system.
audilover

Homework Statement

There is a graph PxV. Pressure is obviously constant so it is a strait line and volume is from point A (1) to point B (3.5). You do not need to solve anything but it asks if work is being done on the system or by the system.

U=Q-W

The Attempt at a Solution

I thought work is being done on the system because when going from point A to point B you are increasing meaning your Q>0.

Going from point A to point B, you are increasing what? Also, Q has nothing to do with whether work is being done on or by the system. Even if you solve this problem based on what I wrote below, it might be worth explaining what you were thinking originally. I'm guessing you have a common misconception that may be worth clearing up.

All you need to do for this problem is figure out the sign of W. If W>0, the work is subtracting from the internal energy U of the system, so work is being done by the system on its surroundings. Similarly, if W<0, work is done on the system.

What is an isobaric system?

An isobaric system is a thermodynamic system in which the pressure remains constant while the system undergoes a change in volume or work is done on or by the system.

What is the significance of work done in an isobaric system?

The work done in an isobaric system is important because it helps to determine the change in internal energy of the system. It also helps to understand the energy transfer that occurs within the system.

How is work calculated in an isobaric system?

Work in an isobaric system is calculated by multiplying the constant pressure by the change in volume or displacement of the system: W = PΔV. This equation assumes that the pressure remains constant throughout the process.

Can work be done on or by the system in an isobaric process?

Yes, work can be done on or by the system in an isobaric process. If the system undergoes a change in volume, work is done on or by the system depending on the direction of the change in volume. If the system remains at a constant volume, no work is done on or by the system.

What is the difference between isobaric and isochoric systems?

The main difference between isobaric and isochoric systems is that in an isobaric system, the pressure remains constant while the volume changes, whereas in an isochoric system, the volume remains constant while the pressure changes.

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