Gas

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Lily Mohtashami
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Gas

Postby Lily Mohtashami » Thu Jan 14, 2021 1:22 pm

How do we know if a gas is in bar or atm?

Sabina House 2A
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Re: Gas

Postby Sabina House 2A » Thu Jan 14, 2021 1:29 pm

I think you would be given the units of the pressure of a gas. If they ask for a different unit in the answer, then you could just convert between the units, but bar and atm are very similar in value so there is not much difference between their values.

Anirudh Mahadev 1G
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Re: Gas

Postby Anirudh Mahadev 1G » Thu Jan 14, 2021 2:39 pm

The question should always specify the units, since the gas constant we use is dependent on the units of the problem. Furthermore, it would only matter when choosing the gas constant because bar and atm are essentially equivalent.

Rahul Sobti 1E
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Re: Gas

Postby Rahul Sobti 1E » Thu Jan 14, 2021 2:44 pm

1 bar = .9869 atm. The problem should always give you units and if you need you can convert between units with that ratio.

Gillian Gabrielsen2F
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Re: Gas

Postby Gillian Gabrielsen2F » Thu Jan 14, 2021 5:25 pm

In one of the lecture, Lavelle said that for purposes of this class we can use atm and bar interchangeably. So even though they technically aren't equal, for this course we can assume 1atm=1bar

Madison Muggeo 3H
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Re: Gas

Postby Madison Muggeo 3H » Thu Jan 14, 2021 9:24 pm

We should be given the units in whatever question we have, but 1 bar is roughly equal to 1 atmosphere so we use them interchangeably

kentbui1d
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Re: Gas

Postby kentbui1d » Fri Jan 15, 2021 12:33 am

Like the others have said, we can interchangeably use bar and atm for this class. They aren't exactly the same, but they are close enough.

Queena Chu 3E
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Re: Gas

Postby Queena Chu 3E » Fri Jan 15, 2021 1:13 am

The question will usually give you which unit to use but since 1 bar is roughly equal to 1 atm, we can use them interchangeably.

Adam Bustamante 1I
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Re: Gas

Postby Adam Bustamante 1I » Fri Jan 15, 2021 9:39 am

I think we'd be asked to give it in either bar or atm, but in one of the lecture videos he said that 1 bar is approximately 1 atm, so I guess its just up to whether the problem is asking for bar or atm in units.

aashmi_agrawal_3d
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Re: Gas

Postby aashmi_agrawal_3d » Fri Jan 15, 2021 10:51 am

I think the question would specify the units. Lavelle also mentioned that we can use them interchangeably in this class because they are approximately equal.

Samudrala_Vaishnavi 3A
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Re: Gas

Postby Samudrala_Vaishnavi 3A » Fri Jan 15, 2021 5:21 pm

Gases for the partial pressure use atm and bars interchangeably (since they are basically the same value/ a lot like Watts and Joules if that makes any sense). It's just that our books use bars rather than atm. more often.

Brenda Silva 1B
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Re: Gas

Postby Brenda Silva 1B » Fri Jan 15, 2021 6:02 pm

The question should mention the units that are being used whether it be bar or atm, but Dr.Lavelle did mention that for this class we would be using atm and bar interchangeably although they are not necessarily equal.

Mackenzie Van Val 3E
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Re: Gas

Postby Mackenzie Van Val 3E » Fri Jan 15, 2021 7:34 pm

Typically, the units of the gas will be given in the equation. Bar is the SI unit for gas, so if it does not say a unit, it may be safe to assume that the gas is measured in bar. However, atm and bar are so close that the professor said we can typically trade them out without consequence.

Tanner Bartyczak 1K
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Re: Gas

Postby Tanner Bartyczak 1K » Sat Jan 16, 2021 1:20 am

The units would usually be given, but they can be interchanged in this class because they are similar.

Xavier Herrera 3H
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Re: Gas

Postby Xavier Herrera 3H » Sat Jan 16, 2021 11:28 am

Although bar is technically the correct unit to use for pressure in equilibrium equations, we use bar and atm interchangeably in this class. Dr. Lavelle said that we will usually use atm, but a problem might give you bar instead.

apurva-3E
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Re: Gas

Postby apurva-3E » Sat Jan 16, 2021 11:53 am

You would be given the units most of the time.

JaesalSoma1E
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Re: Gas

Postby JaesalSoma1E » Sat Jan 16, 2021 2:55 pm

You'll probably get the units from the question and if not, you can just convert to the correct one at the end of the question.


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