## Pressure in an open beaker

Maya Gollamudi 1G
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

### Pressure in an open beaker

In an open beaker system, how do we know that the system is at constant pressure?

Daniel Chen 2L
Posts: 101
Joined: Fri Aug 30, 2019 12:15 am

### Re: Pressure in an open beaker

Since the beaker is an open system, you can assume that the pressure is whatever the atmospheric pressure is. Unless you are somehow constantly changing in elevations or something else, I think you can otherwise assume that the pressure is constant?

Altamash Mahsud 1I
Posts: 50
Joined: Fri Aug 09, 2019 12:16 am

### Re: Pressure in an open beaker

For an open beaker system, the beaker is open to the atmosphere, therefore the system and surroundings have the same pressure, in this case, it is the atmospheric pressure.

Tiffany Chao 2H
Posts: 117
Joined: Fri Aug 09, 2019 12:17 am

### Re: Pressure in an open beaker

Pressure should be the pressure of the atmosphere

Sartaj Bal 1J
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Joined: Thu Jul 25, 2019 12:17 am

### Re: Pressure in an open beaker

All of the above answers are correct. Something that I found helpful to remember regarding the differences between a system and its surroundings is the ocean analogy. Spilling half a liter of water into the ocean doesn't affect its pressure.

Posts: 125
Joined: Sat Aug 17, 2019 12:17 am

### Re: Pressure in an open beaker

Maya Gollamudi 1G wrote:In an open beaker system, how do we know that the system is at constant pressure?

The pressure in an open beaker is constant.

The surrounding system is so large that your reaction will have virtually no influence on the surrounding system's pressure; as a result, your pressure is constant.

305385703
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Joined: Thu Jul 11, 2019 12:15 am

### Re: Pressure in an open beaker

Adding moles of gas to the atmosphere does not change its overall pressure in a way that's measurable. Therefore, an open system has a constant external pressure.

Andres Merlos 2L
Posts: 46
Joined: Wed Sep 18, 2019 12:17 am

### Re: Pressure in an open beaker

An open beaker system allows the exchange of pressure between its surroundings and the system. Since the atmosphere is relatively large, the pressure of the beaker will not have an effect on it, almost like a drop-in-the-bucket type deal. We can then infer a constant pressure because of this.

MeeraBhagat
Posts: 95
Joined: Sat Aug 24, 2019 12:15 am

### Re: Pressure in an open beaker

In an open beaker, the system is at constant pressure because there is no volume to contain any increase or decrease in pressure, and the pressure of the system will be the same as the atmosphere.

Angela Wu-2H
Posts: 50
Joined: Fri Aug 30, 2019 12:16 am

### Re: Pressure in an open beaker

Is the constant pressure being referred to by everyone just 1 atm? Or will the actual pressure be given with the question?

Nathan Rothschild_2D
Posts: 131
Joined: Fri Aug 02, 2019 12:15 am

### Re: Pressure in an open beaker

Actual pressure should be given. If it is not given it will cancel out and not be necessary for calculations

Samuel Tzeng 1B
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Joined: Sat Aug 24, 2019 12:15 am

### Re: Pressure in an open beaker

Pressure in an open beaker is always constant since there isn't a volume to drop or increase pressure

J_CHEN 4I
Posts: 54
Joined: Tue Nov 14, 2017 3:01 am

### Re: Pressure in an open beaker

The pressure in an open beaker would be the pressure of the surroundings. The surroundings is typically at a constant pressure.

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