Kelvin or Celsius?

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Veronica Lu 2H
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Kelvin or Celsius?

Postby Veronica Lu 2H » Sun Feb 09, 2020 10:03 pm

when using PV=nRT is the temperature supposed to be celsius or kelvin?

KSong_1J
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Re: Kelvin or Celsius?

Postby KSong_1J » Sun Feb 09, 2020 10:05 pm

I think you use Kelvin because the gas constant R always has Kelvin in the denominator so they cancel out!

Timmy Nguyen Dis 1I
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Re: Kelvin or Celsius?

Postby Timmy Nguyen Dis 1I » Sun Feb 09, 2020 11:01 pm

Use Kelvin

Shrayes Raman
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Re: Kelvin or Celsius?

Postby Shrayes Raman » Sun Feb 09, 2020 11:21 pm

Kelvin... The gas constant R is listed in Kelvin so Kelvin is used in equation.

Alexis Robles 2k
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Re: Kelvin or Celsius?

Postby Alexis Robles 2k » Sun Feb 09, 2020 11:58 pm

Whenever it is T alone, you should use kelvin but when it is deltaT, you can use Celcius or kelvin.

Venus_Hagan 2L
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Re: Kelvin or Celsius?

Postby Venus_Hagan 2L » Mon Feb 10, 2020 12:02 am

for the ideal gas equation use Kelvin but if you ever need the change in temperature it doesn't matter because both are scaled the same way

gconcha
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Re: Kelvin or Celsius?

Postby gconcha » Mon Feb 10, 2020 12:07 am

Kelvins are always used when applying the ideal gas law

The reason this is done is because Kelvins are more mathematically accurate in terms of chemically applying the excited state of the molecules in a gas to your calculations. zero K is the same as zero energy in the molecules, and is therefore the same as zero movement of the molecules. This is more mathematically correct than -273.15oC
If you really want, I'm sure you could look up values for the Ideal Gas Constant , but most are given in K because they're better for representing how the energy of the molecules affects the context.

Rosa Munoz 2E
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Re: Kelvin or Celsius?

Postby Rosa Munoz 2E » Sun Feb 16, 2020 9:10 pm

Kelvin. it only doesn't matter if we are talking about change. If it is a capital T then it must be Kelvin

Juana Abana 1G
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Re: Kelvin or Celsius?

Postby Juana Abana 1G » Tue Feb 18, 2020 9:13 pm

You would use kelvin.

Aarushi Solanki 4F
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Re: Kelvin or Celsius?

Postby Aarushi Solanki 4F » Tue Feb 18, 2020 9:20 pm

Kelvin, because the gas constant R is usually in terms of Kelvins.

205405339
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Re: Kelvin or Celsius?

Postby 205405339 » Tue Feb 18, 2020 9:36 pm

temperature is always kelvin

Jesse Anderson-Ramirez 3I
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Re: Kelvin or Celsius?

Postby Jesse Anderson-Ramirez 3I » Sun Feb 23, 2020 11:28 pm

Should use Kelvin so the units match the constant.

Anish Natarajan 4G
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Re: Kelvin or Celsius?

Postby Anish Natarajan 4G » Sun Mar 01, 2020 8:57 pm

Technically it's all dependent on the value of R that you use, but in most cases you'll be given a value that incorporates Kelvin rather than Celsius

Orrin Zhong 4G
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Re: Kelvin or Celsius?

Postby Orrin Zhong 4G » Sun Mar 01, 2020 8:58 pm

Temperature is always Kelvin in PV = nRT.

AronCainBayot2K
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Re: Kelvin or Celsius?

Postby AronCainBayot2K » Sun Mar 01, 2020 8:58 pm

Kelvin because the ideal gas constant is in terms of Kelvin not celsius.

CalvinTNguyen2D
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Re: Kelvin or Celsius?

Postby CalvinTNguyen2D » Sun Mar 01, 2020 9:28 pm

You will almost always be using Kelvin in equations and calculations; in terms of the gas constant, it is measured in Kelvin rather than Celsius.

Celine 1F
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Re: Kelvin or Celsius?

Postby Celine 1F » Sun Mar 01, 2020 9:32 pm

Definitely use Kelvin

105311039
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Re: Kelvin or Celsius?

Postby 105311039 » Sun Mar 01, 2020 9:38 pm

you must use Kelvin because of the units in the gas constant R

Sean Tran 2K
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Re: Kelvin or Celsius?

Postby Sean Tran 2K » Sun Mar 01, 2020 11:46 pm

Use Kelvin, as the gas constant R includes it.

605395381
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Re: Kelvin or Celsius?

Postby 605395381 » Mon Mar 02, 2020 8:03 am

kelvin, just make sure the units for R is the same

AveryAgosto
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Re: Kelvin or Celsius?

Postby AveryAgosto » Mon Mar 02, 2020 8:51 am

You should use Kelvin because R uses Kelvin.

Esha Chawla 2E
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Re: Kelvin or Celsius?

Postby Esha Chawla 2E » Mon Mar 02, 2020 9:07 am

Veronica Lu 2H wrote:when using PV=nRT is the temperature supposed to be celsius or kelvin?


The units for R are L*atm/mol*K. Based on this information, we can determine that R should be in Kelvin.

In general, most chemical reactions use temperature in Kelvin.

Aarushi Solanki 4F
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Re: Kelvin or Celsius?

Postby Aarushi Solanki 4F » Mon Mar 02, 2020 10:12 am

It's supposed to be in Kelvin. Generally, we use Kelvin, but it is okay to use Celsius in equations involving the "change of T" since the scaling is the same for Kelvin and Celsius.

Gurmukhi Bevli 4G
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Re: Kelvin or Celsius?

Postby Gurmukhi Bevli 4G » Sat Mar 07, 2020 12:20 am

The temperature should be in kelvin.

Brandi 2C
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Re: Kelvin or Celsius?

Postby Brandi 2C » Sat Mar 07, 2020 12:26 am

Since the STP (standard temperature and pressure) and R constant are in units of Kelvin, you should be using Kelvin for your calculations. If the problem does ask for the answer in units of Celsius, just do the calculations in Kelvin and then convert to Celsius after completing the calculations so you don't mess up unit calculations.

Madeline Phan 1E
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Re: Kelvin or Celsius?

Postby Madeline Phan 1E » Sat Mar 07, 2020 11:01 am

You use Kelvin since the units of R include Kelvin.

Yailin Romo 4G
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Re: Kelvin or Celsius?

Postby Yailin Romo 4G » Sat Mar 07, 2020 10:42 pm

Temperature is always in Kelvin, not Celsius.

Owen-Koetters-4I
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Re: Kelvin or Celsius?

Postby Owen-Koetters-4I » Sun Mar 08, 2020 6:40 pm

kelvin

Areli C 1L
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Re: Kelvin or Celsius?

Postby Areli C 1L » Sun Mar 08, 2020 10:02 pm

yup, as mentioned above, you would use Kelvin.

Justin Quan 4I
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Re: Kelvin or Celsius?

Postby Justin Quan 4I » Mon Mar 09, 2020 1:50 pm

Veronica Lu 2H wrote:when using PV=nRT is the temperature supposed to be celsius or kelvin?

To add on, you use kelvin especially since the constant R is in kelvin, not celsius. However, if you use PV=nR∆T, the you may use either celsius or kelvin since the change in temperature would be the same.

Alfred Barrion 2H
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Re: Kelvin or Celsius?

Postby Alfred Barrion 2H » Mon Mar 09, 2020 1:54 pm

You should use Kelvin since it matches with the gas constant R to cancel out.

105335337
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Re: Kelvin or Celsius?

Postby 105335337 » Mon Mar 09, 2020 2:10 pm

You use Kelvin because you must match the units within the R (gas constant) which uses kelvin.

pmokh14B
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Re: Kelvin or Celsius?

Postby pmokh14B » Mon Mar 09, 2020 2:18 pm

kelvin because the gas constant is always in terms of kelvin.

William Chan 1D
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Re: Kelvin or Celsius?

Postby William Chan 1D » Wed Mar 11, 2020 10:24 pm

Kelvin. If the reaction happened at below 0°C, then the subsequent equation would be negative, having some weird consequences (i.e., negative pressure, negative volume).

Bryan Chen 1H
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Re: Kelvin or Celsius?

Postby Bryan Chen 1H » Wed Mar 11, 2020 10:25 pm

it depends on the unit of the gas constant. if its .08206 Latm/Kmol then use Kelvin, but another gas constant COULD have its units in celcius for whatever reason and then you should use celcius (but it probably will never ever come up in real life or a problem)

Leonardo Le Merle 1D
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Re: Kelvin or Celsius?

Postby Leonardo Le Merle 1D » Thu Mar 12, 2020 11:06 am

Kelvin = Celsius + 273.15; the two are on the same scale so converting between the two isn't too tricky.

Tanmay Singhal 1H
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Re: Kelvin or Celsius?

Postby Tanmay Singhal 1H » Thu Mar 12, 2020 11:07 am

kelvin because the gas constant R is in K. sometimes it is in C and in that case u would use C

Kavya Immadisetty 2B
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Re: Kelvin or Celsius?

Postby Kavya Immadisetty 2B » Thu Mar 12, 2020 11:23 am

Kelvin, just make sure all the units cancel

Rodrigo2J
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Re: Kelvin or Celsius?

Postby Rodrigo2J » Thu Mar 12, 2020 11:45 am

Kelvin

Alan Cornejo 1a
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Re: Kelvin or Celsius?

Postby Alan Cornejo 1a » Sun Mar 15, 2020 8:06 am

Use kelvin and make sure your units match up.

Elizabeth Harty 1A
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Re: Kelvin or Celsius?

Postby Elizabeth Harty 1A » Sun Mar 15, 2020 12:50 pm

Kelvin

Anushka Chauhan2B
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Re: Kelvin or Celsius?

Postby Anushka Chauhan2B » Sun Mar 15, 2020 1:22 pm

kelvin

Ayushi2011
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Re: Kelvin or Celsius?

Postby Ayushi2011 » Mon Mar 16, 2020 6:10 pm

Kelvin is always the unit for such equations.

Charlene Datu 2E
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Re: Kelvin or Celsius?

Postby Charlene Datu 2E » Mon Mar 16, 2020 7:12 pm

It's always in Kelvin because the R constant uses units of Kelvin

BAlvarado_1L
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Re: Kelvin or Celsius?

Postby BAlvarado_1L » Tue Mar 17, 2020 12:27 pm

kelvin so it cancels out with the units of R

SVajragiri_1C
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Re: Kelvin or Celsius?

Postby SVajragiri_1C » Tue Mar 17, 2020 8:42 pm

You use Kelvin, because the unit for R in this equation has K in it.

EllieSchmidtke_4I
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Re: Kelvin or Celsius?

Postby EllieSchmidtke_4I » Tue Mar 17, 2020 9:31 pm

Use Kelvin since this is the SI unit for temperature.

Bella Townsend
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Re: Kelvin or Celsius?

Postby Bella Townsend » Tue Mar 17, 2020 10:19 pm

Typically, you only ever use celsius is there is a change in temperature (delta T) because then the units don't matter. The difference will be the same.

Susan Chamling 1F
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Re: Kelvin or Celsius?

Postby Susan Chamling 1F » Sun Jan 10, 2021 10:33 pm

Use Kelvin because it will cancel with the units for R.

Ariel Guan 1H
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Re: Kelvin or Celsius?

Postby Ariel Guan 1H » Mon Jan 11, 2021 6:37 pm

Kelvin because SI units

Katie Phan 1K
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Re: Kelvin or Celsius?

Postby Katie Phan 1K » Sun Jan 17, 2021 12:18 am

Kelvin

Nick P 3D
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Re: Kelvin or Celsius?

Postby Nick P 3D » Sun Jan 17, 2021 1:03 am

Using PV=nRT you always use kelvin

David Jen 1J
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Re: Kelvin or Celsius?

Postby David Jen 1J » Sun Jan 17, 2021 2:46 am

use kelvin.

Will Skinner
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Re: Kelvin or Celsius?

Postby Will Skinner » Sun Jan 17, 2021 8:22 am

It is always kelvin.

Rajshree 1F
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Re: Kelvin or Celsius?

Postby Rajshree 1F » Sun Jan 17, 2021 9:17 am

kelvin i am pretty sure

Emma Strassner 1J
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Re: Kelvin or Celsius?

Postby Emma Strassner 1J » Sun Jan 17, 2021 11:08 am

Hi, you would use Kelvin and make sure to convert from other units like Celsius.

Mursall M 2A
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Re: Kelvin or Celsius?

Postby Mursall M 2A » Tue Jan 19, 2021 9:39 am

You should be using Kelvin so it can cancel with the units for the R constant.

Keeryth Sandhu 1H
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Re: Kelvin or Celsius?

Postby Keeryth Sandhu 1H » Tue Jan 19, 2021 12:54 pm

I'm pretty sure Kelvin

Ismar Zamora
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Re: Kelvin or Celsius?

Postby Ismar Zamora » Thu Jan 21, 2021 7:18 pm

Kelvin

Maya Johnson 2a
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Re: Kelvin or Celsius?

Postby Maya Johnson 2a » Thu Jan 21, 2021 8:34 pm

Use Kelvin.

Gwirnowski 3B
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Re: Kelvin or Celsius?

Postby Gwirnowski 3B » Sat Jan 23, 2021 8:52 pm

Kelvin is always used with the ideal gas law as the units need to cancel out in the end.

Michelle Nguyen 3F
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Re: Kelvin or Celsius?

Postby Michelle Nguyen 3F » Sat Jan 23, 2021 11:56 pm

Kelvin is the units used in the ideal gas law!

Katelyn_Ortega_1D
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Re: Kelvin or Celsius?

Postby Katelyn_Ortega_1D » Sun Jan 24, 2021 12:01 am

You should be using kelvin, not celsius.

Taylor Newville 1C
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Re: Kelvin or Celsius?

Postby Taylor Newville 1C » Sun Jan 24, 2021 12:06 am

You would use Kelvin. If you are ever unsure about what units to use, look at the units of the equation's constant to see what needs to be canceled out. For the Ideal Gas Law, the gas constant R= 8.314 J/mol·K, so the temperature needs to be in Kelvins too.

Crystal Pan 2G
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Re: Kelvin or Celsius?

Postby Crystal Pan 2G » Sun Jan 24, 2021 12:45 am

That equation requires the usage of Kelvins.

Darlene Lien 3E
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Re: Kelvin or Celsius?

Postby Darlene Lien 3E » Sun Jan 24, 2021 12:47 am

You would use Kelvin. If you look at the constants and equations sheet, the units for the rate are in Kelvin. Hope this helps!

Joshua Chung 2D
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Re: Kelvin or Celsius?

Postby Joshua Chung 2D » Sun Jan 24, 2021 9:02 pm

Default to Kelvin here.

Lauren Strickland 1B
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Re: Kelvin or Celsius?

Postby Lauren Strickland 1B » Sun Jan 24, 2021 9:08 pm

It would be kelvin.

Rayna Irving 2C
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Re: Kelvin or Celsius?

Postby Rayna Irving 2C » Sun Jan 24, 2021 9:40 pm

Kelvin because in this case the rate, R, is a value that corresponds with the unit Kelvin.

Jack Kettering 3D
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Re: Kelvin or Celsius?

Postby Jack Kettering 3D » Sun Jan 24, 2021 9:52 pm

Always use kelvin as this is the SI unit for temperature

Bai Rong Lin 2K
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Re: Kelvin or Celsius?

Postby Bai Rong Lin 2K » Sun Jan 24, 2021 10:05 pm

I believe we are supposed to use the kelvin when solving.

Jiapeng Han 1C
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Re: Kelvin or Celsius?

Postby Jiapeng Han 1C » Fri Jan 29, 2021 7:07 pm

Temperature is in Kelvin!

Brandon Le 3C
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Re: Kelvin or Celsius?

Postby Brandon Le 3C » Fri Jan 29, 2021 9:00 pm

Using Kelvin is more beneficial because it is a more accurate measurement of the movement of molecules that determine the temperature of a system.

LeanneBagood_2F
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Re: Kelvin or Celsius?

Postby LeanneBagood_2F » Sat Jan 30, 2021 12:46 am

as everyone has already said, temperature is always in Kelvin. this is not limited to just the PV = nRT equation as we will see throughout the remaining weeks

Sejal Parsi 3K
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Re: Kelvin or Celsius?

Postby Sejal Parsi 3K » Sat Jan 30, 2021 2:14 am

I believe you would use Kelvin as the constant R uses that unit as well.

Joshua Swift
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Re: Kelvin or Celsius?

Postby Joshua Swift » Sat Jan 30, 2021 6:24 pm

You would use Kelvin, but if you are calculating T, kelvin or celsius works.

Violet Kwan 3H
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Re: Kelvin or Celsius?

Postby Violet Kwan 3H » Sat Jan 30, 2021 7:00 pm

Kelvin is the SI unit for temperature, so I believe you would use that. Also, the conversion is just adding 273.15 to Celsius, so better just to be safe and convert to Kelvin.

Ethan Goode 2H
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Re: Kelvin or Celsius?

Postby Ethan Goode 2H » Sat Jan 30, 2021 9:16 pm

I believe you should be using Kelvin when looking at PV=nRT

Edison Tham 3D
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Re: Kelvin or Celsius?

Postby Edison Tham 3D » Sat Jan 30, 2021 9:17 pm

Typically, since the gas constant R is given in Kelvin, we would use temperature in Kelvin when looking at the equation PV=nRT.

Will Skinner
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Re: Kelvin or Celsius?

Postby Will Skinner » Sun Jan 31, 2021 7:44 am

It should be Kelvin

Chinyere Okeke 2J
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Re: Kelvin or Celsius?

Postby Chinyere Okeke 2J » Sun Jan 31, 2021 8:30 am

In this class and most Thermodynamic classes in the US, we are doing our calculations in Kelvin, this is because a lot of values/constants have Kelvin in their units not Celsius. The only time you wouldn't need to change the degrees is when you are doing change in temperature since change in 1 K = change in 1 degree-Celsius.

Claudia_Danysh_2B
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Re: Kelvin or Celsius?

Postby Claudia_Danysh_2B » Sun Jan 31, 2021 2:10 pm

The temperature is supposed to be in Kelvin!!

Rose_Malki_3G
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Re: Kelvin or Celsius?

Postby Rose_Malki_3G » Sun Jan 31, 2021 3:01 pm

It is supposed to be in kelvin(:

Charmaine Ng 2D
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Re: Kelvin or Celsius?

Postby Charmaine Ng 2D » Sun Jan 31, 2021 3:04 pm

You use Kelvin so that the units cancel out! :))

Jordan Tatang 3L
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Re: Kelvin or Celsius?

Postby Jordan Tatang 3L » Sun Jan 31, 2021 3:10 pm

Kelvin

jasmineculilap_3F
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Re: Kelvin or Celsius?

Postby jasmineculilap_3F » Sun Jan 31, 2021 3:18 pm

kelvin bc R is in kelvin

Ximeng Guo 2K
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Re: Kelvin or Celsius?

Postby Ximeng Guo 2K » Sun Jan 31, 2021 6:47 pm

Kelvin(K)
K=℃+273


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