It is due to water hammering effect.
Could be hydraulic shock (water hammer)
somehow you'll hear a windy noise in the water line
As far as I know, its usually a loose washer in the piping somwhere or a mishapen one. An old plumber told me if you hammer the washer on flat surface, that can correct it. Basically as you run the water it resonates creating the noise. The washer is probably in the faucet btw. Like I said I'm no expert just saying from experience.
hole in fuel line inside tank
The Quindar tones were there because of the button the astronauts had to press made that noise. The noise was there just to indicate that the microphone was being turned on/ off. And Hustons microphone didnt require a beep as it was an open line
If the drain line from the ac unit is tied into the sink drain line, the trap leaving the ac unit has probably run dry. Fill the trap at the ac unit with a cup of water and it should stop the noise. Assuming a proper install, kinda hard guessing about it from here without seeing it.
bunn has several but they are pricy
intermodulation noise
the hot side probably has a restriction either in a faucet or the line itself.and the line noise you are hearing is caused by a water line that has come lose and also improper instalation of air chamber or hyderister.
You would add coolant (not water) to the vehicle's reservoir when it is off and cooled down. Fill it to the cold line.
Gaussian noise is similar to white noise, but it falls within a narrower range of frequencies. In communications, it is produced by the movement of electricity through the line. You see and hear that when you have your television on an empty channel. Within photos and videos, Gaussian noise is in the form of random patterns, and this is what makes things look slightly blurry.
fuel pump makes noise when hot. indication of fuel pump getting ready to fail. or may continue to operate for months like this. filling tank cools fuel pump assy and quiets the noise - maybe prolongs life of fuel pump.