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Posted by Lou on February 23, 2007, 9:22 am
spamTHISbrp@yahoo.com wrote:
> wrote:
>>
>>
>>> I've always wondered about this....
>>> When I turn on the hot water, cold water comes out at first, then the hot
>>> water gets to the faucet after a bit. When the hot water arrives, the
>>> faucet makes a different sound!
>>> Why is this?
>> The cold is right there but the hot has to come from the heater and the
>> travel time is what you are noticing.
>>
>> Hot water is less dense and experiences a different turbulence (and sound)
>> as it passes through the valve mechanism.
>
>
> And, as the water de-pressurizes gases come out of solution and form
> new bubbles.
>
> Water holds more dissolved gases when cold, but the gases stay in
> solution in the water heater because of the pressure.
> The water gets to the valve, the pressure goes down dramatically, and
> the gases come out of solution.
>
> This is the same mechanism that causes bubbles to form at the bottom
> of a pot of water on the stove long before its boiling.
>
> Dave
>
Gee I just learned stuff about something I never even thought about:-))
Lou
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