3 ms·
Heat is energy that causes something to raise in temperature, and is measured in Joules. Entropy is a harder to pin down concept, related to the internal state
by tsimionescu 2y ago
Heat is energy that causes something to raise in temperature, and is measured in Joules. Entropy is a harder to pin down concept, related to the internal state of a system, and is measured in Joules/kelvin. In certain processes, the change in entropy is equal to the change in heat divided by the temperature of the system.
- ainoobler 2y agoSounds like it's the same thing.
- tsimionescu 2y agoIt is not. Two bodies can have different entropy even if they are emitting the same amount of heat.
- ainoobler 2y agoWhere are the calculations?
- tsimionescu 2y agodS = dQ / T
- ainoobler 2y agoSo T = dQ/dS. Seems like the same thing.
- tsimionescu 2y agoIf they were the same thing, then T=1. Since there are many many bodies with T != 1, it follows that dQ is rarely equal to dS.
- HPsquared 2y agoThey are closely related but not the same. DeltaS = DeltaQ /T A lot of it comes down to whether a process is reversible or not. I've taken multiple courses on thermodynamics and still only understand it a little.