## units conversion for entropy

$\Delta S = \frac{q_{rev}}{T}$

Hannah Krusenoski 2L
Posts: 31
Joined: Fri Sep 29, 2017 7:06 am

### units conversion for entropy

Does it matter whether the units for entropy are in J/K or kj/K?

Melodie Oh 2A
Posts: 22
Joined: Fri Sep 29, 2017 7:06 am

### Re: units conversion for entropy

It doesn't really matter but usually entropy is in J/K due to the equation of S=q/T

Harrison Wang 1H
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

### Re: units conversion for entropy

The only case where this would matter would be in a problem and some values are in j/k and kj/k. Here, you would convert all units to either j/k or kj/k.

Sarah Rutzick 1L
Posts: 50
Joined: Tue Oct 10, 2017 7:13 am

### Re: units conversion for entropy

It doesn't matter what unit you use as long as you use the same unit for any other steps in the problem

Helen Shi 1J
Posts: 78
Joined: Sat Jul 22, 2017 3:00 am

### Re: units conversion for entropy

I understand that the units for entropy is J/K, but can someone explain the reasoning behind it other than that it comes from the equation: delta S= q/T?

Scott Chin_1E
Posts: 55
Joined: Sat Jul 22, 2017 3:00 am

### Re: units conversion for entropy

I think temperature is usually expressed in Kelvin as most of the conversions and constants are also expressed in Kelvin, so it makes it easier for calculations and as for Joules versus Kilojoules, q is usually found using heat capacity which is expressed in Joules.

Abigail Urbina 1K
Posts: 102
Joined: Thu Jul 27, 2017 3:01 am

### Re: units conversion for entropy

Usually, the units for entropy are J/K. However, it shouldn't really matter. One thing to be mindful of, though, is keeping your units consistent throughout your calculations. Let's say you are adding up different values for entropies. You want to make sure you are adding entropies that all have units of J/K (or kJ/K, should you decide to calculate using those units).