atm or bar

[Vanessa_Ong_3F]

When do I know to convert between atm or bars when calculating partial gas concentrations?

[KyLee 1H]

The ratio of atm to bar is basically 1 to 1; thus, I believe you do not to choose which one is used. You should just use the one given in the problem.

[Holly Do 2J]

You wouldn't have to convert anything because they are so close in value.

[Tania Peymany 1A]

It depends on what the question is asking for. You may not have to convert, but if you do then it would be when you are given a value with the units atm and have to find the pressure in bar, and vice versa.

[Kathryn Heinemeier 3H]

It should be clear in the problem which one you would need to use but the two are very close

[Lauren Wasef 3C]

Since the ratio is the same, you can use whichever one. To be safe, just use the one mentioned in the question.

[Allen Lu 2F]

For the issue of atm vs bar, I believe that the values are of negligible difference. However, I would just use the units given in the question.

[Bela Patel 2B]

The ratio between atm and bar is the same so you do not need to choose which one to use. Instead, just use the units provided in the question.

[Samantha Quevedo 2L]

Bar and atm are very similar but just use the one that is given in the problem!

[Rena Wu 3E]

Hi Vanessa, the problem usually would specify in terms of units of atm or bar, but I believe both units are interchangable, since they have a 1:1 conversion ratio. Hope this helps!

[Madison Yee 2B]

atm and bar are essentially the same thing, so there's no need to worry about the difference

[805401611]

When rounded, atm and bar pretty much have a 1:1 ratio. You will need to utilize/convert to whatever the question is asking for. Hope that helps!

[Mark_Botros_1D]

Furthermore, to add to the discussion, 1 bar is approximately equal to 0.986923 atm. Therefore, you may approximate 1 bar to equal 1 atm.

[LukeYing_3H]

Since 1 atm is extremely close to 1 bar, there's no need do any conversions and the units can be used interchangeably.

[Savannah Licciardello 2C]

Use whatever unit is asked for in the solution. Otherwise just use the original units given. Both measure partial pressure.

[Jaden Nguyen 2A]

Unless the problem says that a conversion is needed, then it is safe to assume that no conversion needs to be done. If you're given partial pressure in bar or atm stick with either or.

[505739628]

I would just look at the units the problem is asking for in your answer. If it doesn't say anything, I would assume atm, unless the original units are given in bars. Also, as many people on this post have replied, the values are really similar I've noticed so I wouldn't worry too much about it because as long as you are consistent with your calculations, the values shouldn't differ that much. Hope this helps!

[Jessica Berejikian]

Atm and bar are so close in value, that we can almost use them interchangeably. I would, however, look at the units used in the problem as well as if it requests a certain unit in the answer.

[Carlie_Dorostkar_1A]

If atm and bar are equal to each other why are the R values different for the different units? Or can you use the values interchangeably.

[Alex Luong 3H]

They are essentially the same (math-wise), so you wouldn't need to convert them.

[Nicole Friday 1E]

Atm and bar are pretty close in value, so you can use them interchangeably. However, depending on the problem you should use the units within the problem.

[Yewon Jang 3K]

1 atm is around 1 bar so if given in atms and you want your answer to be in bars you don't really have to make any conversions except for changing the name of the units. You should follow the units given in the problem. Hope that helps!

[emmakvarnell]

You don't need to convert between atm and bar because they are relatively the same value, so in this course you consider it to have no difference.

[Matthew Nguyen 2F]

It most likely will be specified when a certain unit is used.

[Divya Mehta 2K]

They are pretty much the same so there is no need to convert

[605733348]

You don't have to convert between them.

[Charlie Sjogren-Black]

You don't need to convert

[Lindsey Walter 3E]

You don't need to convert! Just use the units given in the problem.

[Emily Ngo 1E]

Hi Lindsey,
You would not need to convert between atm and bars. 1 atm is approximately 1.013 bars. However, when doing a problem that give bars, you can just assume that they are the same since the values are so close. I've done problems where I just assumed bars = atm and the answer still turned out correct.

[Nicole Ton 3C]

Atm and bar are actually very close in value, so for our purposes, we do not need to convert between the two; we just keep them the same number.

[Chris Van 2J]

The ratios between the two are 1 to 1, so it would be safe just to use the units that are required or given in the question.

[RCortez_1A]

You use the one given in the problem, the ratio between both is 1 to 1.

[Mahli Martinez 2I]

Usually, the problem will distinguish which to use and we likely wont have a problem that asks us to convert the two, since they are so close in value (1 atm = approx 1.013 bar).

[Acharya Ranawat 3E]

Atm and Bar is essentially the same with around a 1 percent difference. For this class I believe we stick to Atm. Hope this helps!