Nothing beats new baby head smell, I really don't understand why they smell so pleasant. We recently had another baby (2nd child) and I'd forgotten how nice it was.
That baby smell triggers oxytocin which acts similar to the reward chemicals someone might get from drugs but also kicks off tribalistic reactions in the human brain.
Probs lots of things around us passuvely disperse particles under room temperature, but in amounts not noticeable to us. With heating applied, this process intensifies, more so if it's closer to 50-100 C°, normal working temps for an actively cooled PC. Think the indoors pool, that keeps the room's air humid even though the water is just warm.