Goldfish

Greg Arnold wrote:
Is the water pressure on a fish at 18,000' different from that at sea
level?

Half.


Jack

Jack wrote:
Greg Arnold wrote:

Is the water pressure on a fish at 18,000' different from that at sea
level?

Half.

No, that's only true for air. Water is (generally speaking) not
compressible and what matters, is the water above you, not the air
pressure at the air/water interface.

Tony V.

Tony Verhulst wrote:

No, that's only true for air. Water is (generally speaking) not
compressible and what matters, is the water above you, not the air
pressure at the air/water interface.

And what matters in the atmosphere? The air above you.

You don't think it's all additive?

The noncompressibility of water has no bearing on the question.



Jack

And what matters in the atmosphere? The air above you.

You don't think it's all additive?

Sure, but the effects of air pressure are second order, if that.

Tony

Tony Verhulst wrote:

And what matters in the atmosphere? The air above you.

You don't think it's all additive?


Sure, but the effects of air pressure are second order, if that.

Wunderbar! Then there is absolutely no reason why the fish would be
worse off at altitude, unless you are worried about gasses in the water
leaving faster and relegating the poor widdle fishies to a less
oxygenated environment.


Jack

And what matters in the atmosphere? The air above you.

You don't think it's all additive?

Sure, but the effects of air pressure are second order, if that.

Since this is soo off topic, this will be my last post on the subject
(we can carry on the conversation via email).

I apologize in advance for the non metric units.

If you're 14 feet under water (1 atmosphere of pressure, and you rise to
7 feet, the pressure on your body will be reduced by 50%. It takes you
18000 ft of air altitude change to achieve the same percentage. If you
are at the bottom of a 14 foot deep tank of water that gets lifted to
18000MSL, the pressure on your body is not reduced by 50% - not even
close to it.

Tony V

Tony Verhulst wrote:

If you're 14 feet under water (1 atmosphere of pressure, and you rise to
7 feet, the pressure on your body will be reduced by 50%. It takes you
18000 ft of air altitude change to achieve the same percentage. If you
are at the bottom of a 14 foot deep tank of water that gets lifted to
18000MSL, the pressure on your body is not reduced by 50% - not even
close to it.

You are overkilling this deeply on-topic discussion of the effects of
altitude on goldfish, Tony, so running away won't get you off the hook.

We are discussing tiny fishes, gold, that spend their lives in a
fishbowl which might be a foot deep. Going to altitude in a glider while
in a gallon baggy of water will not change their fate, no matter the
deeply felt concerns of sundry PETA-people.

Even now the hand-wringers are girding themselves for their next crusade
against those of us who enjoy the occasional salad.

Mein Gott! Can't you hear the olives screaming?


Jack

(I know, winter has gone on too long.)

(I know, winter has gone on too long.)

Tell me about it :-)

On topic, my club is scheduled to start operations on Saturday April 1,
or when mud season ends - often a week or two later.

Tony V.