nothing happens to the testicles themselves. however, if they are overheated for a prolonged period of time it can kill the sperm in them. but a hot day does affect your scrotum (your sack)..it makes it go all soft. this is so your balls are further away from your body so that they can get cooler.
what happens to telephone wires on hot days
in the day it gots very hot but in night it is freezing cold
it gets hot and cold
some do
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It evaporates. No matter if the water is cold, frozen, or even hot it evaporates.
the temperature would drop
The technical term for it is "marage" It happens on very hot days and often happens in the desert/hot places.
If a cool air mass comes in on a hot day, and if there is enough moisture, you can generally expect showers and thunderstorms.
hot irons heated in the fireplace.
The testicles are outside of the body because the optimal temperature for fertilization and operation is below that of standard body temperature. This is why wearing "whitey tighties" may cause sterilization (aka they hold the testicles too close to the body which is too hot).
If there is no expansion joints on a bridge and if it's really hot the molecules of the bridge will be separated slowly and the bridge will collapse