## Pressure in an Open Beaker

Jose Robles 1D
Posts: 100
Joined: Fri Aug 02, 2019 12:15 am

### Pressure in an Open Beaker

Why does an open beaker always have constant pressure?

peteryim
Posts: 54
Joined: Sat Sep 07, 2019 12:17 am

### Re: Pressure in an Open Beaker

An open beaker has constant pressure because you are assuming the only pressure acting upon it is air pressure, which will be uniform on the contents of the beaker.

Sidharth D 1E
Posts: 98
Joined: Sat Aug 24, 2019 12:17 am

### Re: Pressure in an Open Beaker

Since the beaker is open and exposed to the atmosphere (which is very large in comparison to the beaker), the pressure is constant. The beaker can also equilibrate with the pressure of its surroundings.

Ariana Iranmahboub1G
Posts: 114
Joined: Fri Aug 09, 2019 12:17 am

### Re: Pressure in an Open Beaker

Because it can reach equilibrium with the pressure of its surroundings, it will remain at constant pressure. And since the surroundings is so large, the pressure is unchanging.

Jose Robles 1D
Posts: 100
Joined: Fri Aug 02, 2019 12:15 am

### Re: Pressure in an Open Beaker

Since pressure is constant, is that why we assume that it to be 1 atm?

saigorijavolu2k
Posts: 108
Joined: Sat Sep 28, 2019 12:15 am

### Re: Pressure in an Open Beaker

Air pressure is the only pressure acting on the beaker and it does not change. The surroundings encompass a vast area, thus the pressure doesnt change.

peteryim
Posts: 54
Joined: Sat Sep 07, 2019 12:17 am

### Re: Pressure in an Open Beaker

If it says the surroundings are at standard temp and pressure it would be 1atm. If it's not specified, then you probably don't need the specific pressure to solve the problem.

Juana Abana 1G
Posts: 100
Joined: Wed Sep 18, 2019 12:15 am

### Re: Pressure in an Open Beaker

Because of the fact that the beaker is open and exposed to the atmosphere that is very large in comparison to the beaker, the pressure within the beaker remains constant.

gconcha
Posts: 37
Joined: Fri Aug 09, 2019 12:16 am
Location: Sunset Village
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### Re: Pressure in an Open Beaker

Pressure of the beaker is not always technically constant, but because the container of the gas is changed to the environment that the experiment is taking place in as opposed to the inside of the beaker itself, then it can be assumed that the reaction makes a negligible difference in the environment of the room and therefore the pressure is essentially constant.

Bryan Chen 1H
Posts: 58
Joined: Mon Jun 17, 2019 7:24 am

### Re: Pressure in an Open Beaker

if u imagine an open beaker, the constant pressure will be the force of air pressure acting down on it from the environment

Trent Yamamoto 2J
Posts: 111
Joined: Sat Aug 17, 2019 12:18 am

### Re: Pressure in an Open Beaker

For an open beaker, you are assuming that the only pressure against it would be constant air pressure (1atm)