## Units of Temperature

$PV=nRT$

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### Units of Temperature

When using the ideal gas law, which units should the temperature be in? Kelvins or Celsius?

Sid Panda 3A
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### Re: Units of Temperature

Juwan_Madaki_3K wrote:When using the ideal gas law, which units should the temperature be in? Kelvins or Celsius?

Kelvin

Kiara Phillips 3L
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### Re: Units of Temperature

From what I have seen usually questions will provide us with the temperature in Celsius and we are expected to covert it to Kelvin.

Minh-Thy Vo 3D
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### Re: Units of Temperature

You would use Kelvin.

Karl Yost 1L
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### Re: Units of Temperature

Since the gas constant R typically has temperature units in Kelvin (and we want the temperature units to cancel out when solving for P,V or n), we list the temperature in Kelvin.

John Calonia 1D
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### Re: Units of Temperature

When converting between Celsius and Kelvin, you have to add or subtract how many degrees to Celsius to convert it into Kelvin again? And when converting from Fahrenheit, would it be easier to convert it into celsius first?

Jiwon_Chae_3L
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### Re: Units of Temperature

John Calonia 1D wrote:When converting between Celsius and Kelvin, you have to add or subtract how many degrees to Celsius to convert it into Kelvin again? And when converting from Fahrenheit, would it be easier to convert it into celsius first?

to convert Celsius to Kelvin, you add 273.15 to the temperature. I don't think we'll see any questions that expect us to convert Fahrenheit.

Mohamed Mido
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### Re: Units of Temperature

kevin

Maaria Abdel-Moneim 2G
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### Re: Units of Temperature

You would want it to be in Kelvin since the constant R has Kelvins and you want the units to cancel.

Brian Bui 3H
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### Re: Units of Temperature

You would use Kelvin. Often times the temperature is given in Celsius, so you would have to add 273.15 to convert it to Kelvin.

Talia Dini - 3I
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### Re: Units of Temperature

Hi! I believe that you would use Kelvin as the unit for temperature.

Anusha Chaudhary 1J
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### Re: Units of Temperature

For the Ideal Gas Law, you would use Kelvin. If you get a question where it gives you temperature in Celsius, all you have to do is add 273.15 in order to convert it to Kelvin.

Vanessa Perez
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### Re: Units of Temperature

I'm pretty sure we will be using Kelvin. So it will be important to know how to convert to Kelvin if not given Kelvin

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### Re: Units of Temperature

Kelvin! Make sure you know how to convert F, C, and K.

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### Re: Units of Temperature

When working with the ideal gas laws we would use Kelvin as our unit for temperature.

Juliet Carr 1F
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### Re: Units of Temperature

You would use kelvin as it is the SI unit for temperature.

Crystal Pan 2G
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### Re: Units of Temperature

We should be using Kelvins

Ariel Guan 1H
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### Re: Units of Temperature

use Kelvin because it's the SI unit.

Aayushi Jani 3A
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### Re: Units of Temperature

We use Kelvin.

Wil Chai 3D
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### Re: Units of Temperature

if you ever forget, you can just look at the units of the ideal gas constant, which always has K in the denominator.

Eileen Quach Dis 2A
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### Re: Units of Temperature

According to the lecture, we should use Kelvin so that the units cancel out properly.

Inderpal Singh 2L
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### Re: Units of Temperature

We have to use Kelvin, but we will have the conversion equation on the equation sheet I believe in case we are given celsius.

Jiapeng Han 1C
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### Re: Units of Temperature

This one is actually important, we use Kelvin for the temperature in the Ideal Gas Equation.

Mackenzie Stockton 2H
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### Re: Units of Temperature

We always use Kelvin for temperature in PV=nRT. This is simply because the units cancel out with the units of the other species in the equation.

Arnav Saud 2C
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### Re: Units of Temperature

You should use kelvin.

ellenulitsky Dis 1I
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### Re: Units of Temperature

You will always be using Kelvin since when looking at the other units in PV=nRT, there is only kelvin being used, so if using celsius for example, the units will not cancel out. Hope this helps!

Javier Perez M 1H
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### Re: Units of Temperature

So when using PV=NRT temperature is supposed to be inputted in Kelvin? How come though fro most of the questions so far we are being given temperature in Celcius?

Ryan_Page_1J
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### Re: Units of Temperature

Javier Perez M 1H wrote:So when using PV=NRT temperature is supposed to be inputted in Kelvin? How come though fro most of the questions so far we are being given temperature in Celcius?

I have noticed this as well...maybe it's just good conversion practice.

Krish_Ajmani_3J
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### Re: Units of Temperature

Kelvin should be used. If the temperature is given in Celsius, a simple conversion to Kelvin will be enough for you to use the PV=NRT equation correctly.

Chudi Onyedika 3A
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### Re: Units of Temperature

You should use Kelvin for the Ideal Gas Law and other temperature equations.

Simi Kapila_3E
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### Re: Units of Temperature

I believe he mentioned in lecture that it should be in Kelvin, and most likely we should know how to covert from celsius if the problem gives us temperature in that unit.

Melis Kasaba 2B
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### Re: Units of Temperature

For the ideal gas law, the temperature should be in Kelvin. In order for gas laws to work, temperature has to be calculated on an absolute scale (Kelvin) rather than an arbitrary scale (Celsius). 0 K is absolute zero, but 0 C is just the melting point of water.

Liam Bertrand 3
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### Re: Units of Temperature

This should always be in kelvin, and I think the kelvin/celsius conversion formula is on our formula sheet, in case its needed on an exam.

Margaret Xu 3C
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### Re: Units of Temperature

When using the ideal gas law, write the temperature in Kelvin.

Simer_Shera_2D
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### Re: Units of Temperature

Temperature used in calculation must always be in Kelvin

Kayla Booker 1F
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### Re: Units of Temperature

The temperature should be in Kelvins so that the units will cancel out.

Bryan Le 2K
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### Re: Units of Temperature

Hi, the units for temperature should be in Kelvin.

Brenda Silva 1B
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### Re: Units of Temperature

We would need to write the temperature in Kelvin, therefore when we are given the temperature in Celsius we would have to convert it to Kelvin by adding 273.15 to the temperature.

Shana Patel 1C
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### Re: Units of Temperature

We usually use Kelvin when calculating temperature. There is a formula to change Degrees to Kelvin; T(K)=T(C) + 273.15

Karen Elrayes 1L
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### Re: Units of Temperature

Kelvin is used because it has a bigger and more applicable range for the chemicals we are experimenting with

Michelle Nguyen 3F
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### Re: Units of Temperature

For ideal gas law, use Kelvin!

Kathy_Li_1H
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### Re: Units of Temperature

Hi! Since the standard unit of temperature is Kelvin, your answer should always be in Kelvin.

Cooper_Geralds_3B
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### Re: Units of Temperature

Juwan_Madaki_3K wrote:When using the ideal gas law, which units should the temperature be in? Kelvins or Celsius?

I believe most of the time in 14B we will be using Kelvin for temperature unless a specific problem indicates otherwise!

Chelsea_Guzman_3C
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### Re: Units of Temperature

Kelvins are always used. You can convert Celsius to Kelvin by adding 273.15

Mingzi Yang 1E
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### Re: Units of Temperature

Kelvin should be used as the unit of temperature in this case.

Taha 2D
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### Re: Units of Temperature

kelvin is used

Blas_Rodriguez_1B
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### Re: Units of Temperature

From what I have noticed, Kelvin is the preferred temperature unit.

jasmineculilap_3F
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### Re: Units of Temperature

Kelvin. You can convert celsius to kelvin with K = C + 273.15.

Chance Herbert 3A
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### Re: Units of Temperature

Kelvin is the correct unit to use. Using dimensional analysis, you will see that the units of Kelvin cancel out in calculations with ideal gas law! If provided Celsius, you can calculate the temperature in Kelvin by adding 273.15 to this value!

Armen_Isayan_2L
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### Re: Units of Temperature

When you are prompted an ideal gas law, you would expres the temperature in Kelvin. If you are prompted the temperature in units of Celsius you would just convert to Kelvin.

joshtully
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### Re: Units of Temperature

Temperature should be in Kelvin in this instance.

Ariana Flores 3F
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### Re: Units of Temperature

Kelvin!! Thanks for the question!

Keshav Patel 14B 2B
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### Re: Units of Temperature

For the ideal gas law you want to use Kelvins because it often cancels with the R.

RaniyaFeroz_1E
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### Re: Units of Temperature

We should use Kelvin.

Diana Aguilar 3H
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### Re: Units of Temperature

Hi! The units for temperature should be in kelvin I believe.

nayha a 1E
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### Re: Units of Temperature

I believe you should be using Kelvin.

Xinyu Li 1C
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### Re: Units of Temperature

You should use Kelvin.

Jose Miguel Conste 3H
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### Re: Units of Temperature

always has to be in kelvin

Anthony_Sandoval_1D
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### Re: Units of Temperature

In this situation, you would be using kelvin.

Justin Zhang_1A
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### Re: Units of Temperature

Temperature would be in Kelvin.

Jared Limqueco 3E
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### Re: Units of Temperature

The unit of temperature should be in Kelvin.

Daniel Hernandez 1G
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### Re: Units of Temperature

You would use Kelvins. Converting Celsius to Kelvin is simple. All you have to do is add the degrees in Celsius to 273.15.

James_Hankee_1C
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### Re: Units of Temperature

We would use Kelvin when using units of temperature in an equilibrium problem. The temperature of the reaction directly affects the products of the reaction and it is crucial that the units are correct to get our correct answer for our equilibrium constant.

Brandon Le 3C
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### Re: Units of Temperature

When we work with temperature, you'll often times have to convert Celsius to Kelvin units, since Kelvin gives a more accurate description of the speed in which molecules move.

Jacob Schwarz-Discussion 3I
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### Re: Units of Temperature

Juwan_Madaki_3K wrote:When using the ideal gas law, which units should the temperature be in? Kelvins or Celsius?

You would use Kelvin for the ideal gas law

Mehreen 3I
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### Re: Units of Temperature

Juwan_Madaki_3K wrote:When using the ideal gas law, which units should the temperature be in? Kelvins or Celsius?

The temperature should be in Kelvin.

Muskaan Abdul-Sattar
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### Re: Units of Temperature

You should use Kelvin!

Teti Omilana 1G
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### Re: Units of Temperature

Kelvin is the SI unit for temperature.

Caelin Brenninkmeijer 1G
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### Re: Units of Temperature

It should be Kelvin because the gas constant is given in J/mol·K units.

Sam Wentzel 1F 14B
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### Re: Units of Temperature

Kelvin. You need to make sure the units cancel when doing these problems.

sophia kosturos 2B
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### Re: Units of Temperature

Kelvin should be used because the units need to be able to cancel out.

Emily_Stenzler_2H
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### Re: Units of Temperature

do we need to memorize how to convert between units of temperature?

emwoodc
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### Re: Units of Temperature

It would be Kelvin! Dr. Lavelle mentioned it during class.

Uyen Trinh 3C
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### Re: Units of Temperature

0 Kelvin, which is -273.15° on the Celsius scale, is absolute zero. While the Celcius scale is calibrated in terms of the freezing and boiling points of water, the Kelvin scale is calibrated in terms of energy itself. At absolute zero, the substance has no kinetic energy - the lowest possible temperature. Thus, there are no negative numbers on the Kelvin scale to affect calculations and that is why we use it as the SI unit of temperature.

Converting degrees Celcius to Kelvin is relatively simple though so you shouldn't worry too much about that. You just add 273.15 degrees to whatever the Celcius temperature is to get Kelvin. Fahrenheit, on the other hand, is the conversion you should memorize.

Image credit: Wikihow Staff - How to Convert Fahrenheit to Kelvin, 2019

Samantha Lee 1A
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### Re: Units of Temperature

You should always work in Kelvin for calcualtion in Chemistry. Do not use Celsius. For the ideal gas law,
P: pressure [atm]
V: volume [Liters]
n: moles [mol]
R: constant [kg⋅m^2·K^−1⋅mol^−1s^−2], although these units are not as important, if you put the other variables in the correct units - it should cancel
T: temperature [Kelvin]

John_Tran_3J
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### Re: Units of Temperature

Concerning Kc or Kp we will use Kelvin, but we have not gone into detail about when or how to calculate the temperature.

reyvalui_3g
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### Re: Units of Temperature

We will most of the time be using Kelvin.

Mackenzie Van Val 3E
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### Re: Units of Temperature

We should use Kelvin for all of chemistry. Many temperatures will be given in Celsius, so to convert from Celsius to Kelvin, you add 273 to the Celsius temperature.

Shalyn Kelly 3H
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### Re: Units of Temperature

Hi! Kelvin should be used, and I think the conversion is on the equations sheet, but it's also fairly simple so attempting to remember to add 273.15 (in order to convert Celsius to Kelvin) would probably be a good idea.

ShinwooKim_3E
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### Re: Units of Temperature

The units would be in Kelvin.

Sukhkiran Kaur 3I
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### Re: Units of Temperature

I think Kelvin would be most appropriate!

Bryan Le 2K
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### Re: Units of Temperature

The units for temperature should be in Kelvin.

Allan Nguyen 2G
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### Re: Units of Temperature

For chemistry problems, I'm pretty sure you'd always use kelvin.