The water rush makes the noise
Steam heat normal Hot water perhaps air in lines and need to be purged
the reason why the toilet makes noise when you turn water on is because all the water lines are conected so when you turn on water the toilet gets affected and the water that goes down a drain goes to the water pipe.
no
no
The water hitting the ground.
the same noise your mom makes in bed
If the noise is only for a few moments after taking a shower, its the expansion on the hot water side. Water lines going through studs will expand and make noise. the only way to fix this is to get in the wall and either loosen the pipe or tighten it with a shim.
From the water crashing down on the sand.
Could be hydraulic shock (water hammer)
Evaporation of water hasn't an acoustic effect; for boiling the answer is yes.
it may be getting air in the system .
Gargle water in your mouth and that's the sound.