bikerlegs
bikerlegs t1_j5q9frf wrote
Reply to Why does hot air cool? by AspGuy25
Everyone has already mentioned the flaws with the temperature gun so I won't delve into that. Instead I'll explain "wind chill". Temperatures feel colder when there is wind for 2 main reasons.
One of them being evaporation on a wet surface. This is why licking your finger and holding it to the wind helps you tell the wind direction by which side the cold part of your finger is facing. Wind accelerates evaporation which is an endothermic process (absorbs heat).
The second reason is that heat transfered through conduction happens when two molecules bump into each other and exchange their individual kinetic energy. Much like two balls in billiards hitting each other. When a while material is subjected to this the kinetic energy of each molecule is represented as heat. So wind allows more molecules to bump into each other and thus more heat transfer.
Now, it is incredibly important to note that this process of heat transfer through conduction works in a specific way to AVERAGE the temperatures between two materials. So cold air cools and hot hair heats up. Don't believe me? Hold your hand in front of a hair dryer. 😆 Given your material isn't wet evaporation can be dismissed and temperatures will only average. So that means your hot oven is definitely heating any material you throw in it that is at a lesser temperature until they reach a state of equilibrium and the convection (wind) accelerates this process.
bikerlegs t1_j5qdk4w wrote
Reply to comment by jawshoeaw in Why does hot air cool? by AspGuy25
This isn't true. I also just looked on Wikipedia and it explains the same thing I explained. Wind chill is the additional cooling effect that wind brings. Not necessarily from evaporation, it still included conduction. So you're dry computer is still experiencing wind chill by definition.