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### units conversion for entropy

Posted: Thu Feb 01, 2018 4:12 pm
Does it matter whether the units for entropy are in J/K or kj/K?

### Re: units conversion for entropy

Posted: Thu Feb 01, 2018 5:09 pm
It doesn't really matter but usually entropy is in J/K due to the equation of S=q/T

### Re: units conversion for entropy

Posted: Thu Feb 01, 2018 6:55 pm
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.

### Re: units conversion for entropy

Posted: Thu Feb 01, 2018 6:55 pm
It doesn't matter what unit you use as long as you use the same unit for any other steps in the problem

### Re: units conversion for entropy

Posted: Sat Feb 10, 2018 4:44 pm
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?

### Re: units conversion for entropy

Posted: Sat Feb 10, 2018 4:49 pm
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.

### Re: units conversion for entropy

Posted: Sat Feb 10, 2018 5:27 pm
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).