If water is non compressible then sound waves would travel though it
instaneously.

RB

"Wally" wrote in message
...
Does the concept of 'lift' apply to the fins or other underwater structure
on a sailboat?

If so, and if water is non-compressible, then what is its effect and how
does it work?


--
Wally
www.makearatherlonglinkthattakesyounowhere.com
Things are always clearer in the cold, post-upload light.

If water is non compressible then sound waves would travel though it
instaneously.


Hibily Dibily Duh?

Bwahahahahaha!

RB

Sound is a longitudinal pressure wave, whereby the energy is propagated as
deformations in the media but the molecules then return to their original
positions and are not propagated. The propagation of a sound wave depends on
the transfer of vibration from one molecule to another.

The speed (u = [¶r/¶P]S) is inversely proportional to the square root of the
adiabatic compressibility times density term.The anomalous nature of both
these physical properties are described above (compressibility, density). At
low temperatures both compressibility and density are high, so causing a
lower speed of sound. As the temperature increases the compressibility drops
and goes through a minimum whereas the density goes through a maximum and
then drops [67]. Combination of these two properties leads to the maximum in
the speed of sound. Increasing the pressure increases the speed of sound and
shifts the maximum to higher temperatures, both in line with the effect on
the density.

It's quite obvious, if compressibility = 0 then the sound of sound is
instantaneous.

"Bobsprit" wrote in message
...
If water is non compressible then sound waves would travel though it
instaneously.


Hibily Dibily Duh?

Bwahahahahaha!

RB

On Fri, 21 Nov 2003 17:22:32 GMT, "Bobsprit" wrote:

Sound is a longitudinal pressure wave, whereby the energy is propagated as
deformations in the media but the molecules then return to their original
positions and are not propagated. The propagation of a sound wave depends on
the transfer of vibration from one molecule to another.

The speed (u = [¶r/¶P]S) is inversely proportional to the square root of the
adiabatic compressibility times density term.The anomalous nature of both
these physical properties are described above (compressibility, density). At
low temperatures both compressibility and density are high, so causing a
lower speed of sound. As the temperature increases the compressibility drops
and goes through a minimum whereas the density goes through a maximum and
then drops [67]. Combination of these two properties leads to the maximum in
the speed of sound. Increasing the pressure increases the speed of sound and
shifts the maximum to higher temperatures, both in line with the effect on
the density.

It's quite obvious, if compressibility = 0 then the sound of sound is
instantaneous.

"Bobsprit" wrote in message
...
If water is non compressible then sound waves would travel though it
instaneously.


Hibily Dibily Duh?

Bwahahahahaha!

RB
True, I think.
Seawater is compressable but not much.
I read somewhere (Bowditch?) that if water was not compressable the
Atlantic would be 78 feet higher. Or was it 400 feet? lol Somewhere
in that range. )
Mark E. Williams