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Posted by on February 22, 2007, 7:05 pm
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
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