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### Value of Variable Kb

Posted: **Sun Feb 10, 2019 11:51 am**

by **Sophia Diaz - Dis 1B**

In class when we were discussing molecules, possible positions, and residual entropy, we did a calculation with the equation: S = KblnW.

In the equation, Kb was equal to 1.381 x 10^-23 J/K.

Where did we get the value for Kb and what exactly IS Kb?

Thanks, y'all!

### Re: Value of Variable Kb

Posted: **Sun Feb 10, 2019 1:06 pm**

by **megansardina2G**

Kb is Boltzmann's constant. It is provided on the formula sheet.

### Re: Value of Variable Kb

Posted: **Sun Feb 10, 2019 1:09 pm**

by **AnnaYan_1l**

From my understanding, Kb is the Boltzmann constant, and is derived from the gas constant R divided by Avogadro's number. I don't think you need to know this though, as it is on the formula sheet!

Hope this helps!

### Re: Value of Variable Kb

Posted: **Sun Feb 10, 2019 1:17 pm**

by **whitney_2C**

K

_{B} is the Boltzmann constant and it provides a measure of the amount of energy (i.e., heat) corresponding to the random thermal motions of the particles making up a substance. The link below sends you to a video if you want to learn more about it.

https://www.khanacademy.org/science/in-in-class11th-physics/in-in-phy-kinetic-theory/in-in-kinetic-molecular-theory-of-gas/v/boltzmanns-constant

### Re: Value of Variable Kb

Posted: **Sun Feb 10, 2019 2:25 pm**

by **Kriti Goyal 4K 19**

Kb is a constant value, the boltzmann Constant. The value will always be given, we dont need to memorize it. but it helps determine the entropy of a system