The question and answer are locked and cannot be edited.

Why does hot water coming from a faucet have a different pitch noise than cold water coming from a faucet at the same pressure?

already exists.

Would you like to merge this question into it?

already exists as an alternate of this question.

Would you like to make it the primary and merge this question into it?

exists and is an alternate of .

Water Pressure Here is what Contributors had to report on water pressure sounds:
  • First, the temperature of the water affects the internal diameter of the faucet and faucet neck where the water is delivered. Hot water coming through the faucet neck will cause inward expansion, parially closing off the neck and altering the acoustic characteristics of the faucet neck. Cold water will have the opposite effect. Second, hot water follows a different path from cold water. The hot water pipe will have a different length in most cases because it is coming from a different place; this, combined with the resonant frequency of the water heater itself, will alter the resonant frequency of the plumbing compared to the (mostly) straight-through cold water pipes.
  • Actually pipes expand outward when hot. That is, they will have a larger diameter, both internally and externally. They also become longer.
  • The actual answer lies with cavitation of the water... which is where the sound is coming from in the first place.
  • As the water crosses the partially opened valve of the faucet, it undergoes a rapid decrease in pressure. This decrease in pressure leads to the creation and collapse of tiny bubbles of water vapor and dissolved air in the water. This effect is called cavitation and is quite noisy as the small bubbles collapse and generate shock waves. -At colder temperatures, fewer and smaller bubbles with a shorter lifespan are created.
  • At higher temperature, more, longer lasting, and larger bubbles (and the sound they make) are created. This changes both the pitch and intensity of the sound as the water temperature changes. It's also why you can change the sound by opening and closing the valve slightly, which changes the drop in pressure.
87 people found this useful
Thanks for the feedback!

Why would hot water be coming out of the hot and cold faucets?

    HOT WATER PROBLEMS       YOUR HOT WATER TANK NEEDS TO BE REPLACED       Answer     It could be cross connected, I would turn on an

Only cold water comes out of shower hot water faucet?

  I have just the opposite problem.. I'm only getting very hot water coming out of shower head.   What I've been reading is it's most likely the mixing valve/anti-sca

Why does Hot water come from a cold water faucet?

Because someone switched the lines or labeling. < 1- Someone installed the piping not bothering to read modern codes requiring water hot and cold to be 6" apart 2- C/W supply

Glacier bay kitchen faucet water comes out slow hot or cold how do you repair this?

I just brought a Glacier Bay pull down ceramic kitchen faucet Model 896408. After installing it, the cold water wasn't coming out of the faucet. It turned out the problem was

Why does cold water come out of a hot faucet first?

Unless there is a recirculating pump the hot water has to come from the hot water heater. Depending on how far away it is from the faucet, it can take 15 to 30 seconds for the

If you have no hot water coming out of faucet only cold?

Sounds like your water heater is not working. Feel around the hot water heater and the lines and pipes and see if it feels warm. Also, if it's an electric HWH, find the circui

Why is there no water coming out of any hot water faucet?

There should be two valves on or near the top of your water heater. One is for the inlet (cold water) into the heater the other is for the outlet (hot water) out of the heater

Hot water barely comes out of faucet cold water works fine how do i fix?

If shut off the hot water valve then you take off your supply line from your hot water valve to your faucet and then turn your hot water valve on slowly (with of course a buck
In Science

Why does the hot water come out more slowly than the cold water on your bathroom faucet?

Hot means a higher level of energy. In the case of hot water, the particles are much further apart on the microscopic scale than they are in the case of cold water. That is be