Curious about sound...

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by jrseaberg, Mar 19, 2007.

  1. jrseaberg

    jrseaberg New Member

    Joined:
    Dec 24, 2006
    Occupation:
    manage a small business facility
    Location:
    central IL
    This is totally a non-important question; just curious...:confused:

    When I open only the hot water side of any of my faucets, the sound of the water exiting the faucet changes when the water gets warm (it is only a matter of seconds from first turning the faucet on until water gets warm, probably 20' of 1/2" copper from heater to faucet).

    If I had to describe it, it sounds like the "pitch" of the noise of running water changes.

    If this is happening, and I'm not imagining it, why/what is happening?

    Thanks!
    Jim
     
  2. plumber1

    plumber1 Plumber

    Joined:
    Aug 7, 2005
    Location:
    Florida
    If there are bib washers in that faucet, try changing them..
     
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    water

    Hot water has a lower mass than cold water which changes the pitch, just as the sound of air coming from a pipe will change when the lighter natural gas arrives at the valve.
     
  5. geniescience

    geniescience Homeowner

    Joined:
    Nov 27, 2005
    Occupation:
    ditto
    Location:
    humid summers hot, humid winters cold
    another change in noise

    i notice the same thing, as well as a second noise.

    Some kitchen faucets, when hot water reaches them, create a high pitch ("whistle") too, above the base noise. This overtone noise can be heard 30' away -- it carries farther than the base noise, which the person running the water can barely detect above the base noise.

    Running hot water can cause irritation at a distance.

    david
     
  6. jrseaberg

    jrseaberg New Member

    Joined:
    Dec 24, 2006
    Occupation:
    manage a small business facility
    Location:
    central IL
    Thanks!

    I suspected it had to do with the mass/density of the water, but wasn't at all sure I was right.

    Thanks, all, for the responses.
    :)
    Jim S.
     
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