The sign of ΔSsys for Humidity condenses in cold air is negative.
Entropy is the measure of randomness or disorder of a thermodynamic system. Entropy basically gives us the measure us the part of energy that did not converted into work done. This portion of energy increase the disorder of the system.
When the randomness of the energy molecule increase, entropy increases and ΔS becomes positive. When the randomness is decreases, entropy decreases and ΔS becomes negative.
The increase in the randomness of the systems depends upon the addition of heat. When the humidity condenses, the randomness in the molecule decreases and they stay closes so the ΔS becomes negative.
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