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units conversion for entropy

Posted: Thu Feb 01, 2018 4:12 pm
by Hannah Krusenoski 2L
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
by Melodie Oh 2A
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
by Harrison Wang 1H
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
by Sarah Rutzick 1L
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
by Helen Shi 1J
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
by Scott Chin_1E
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
by Abigail Urbina 1K
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).