Re: Isn't Water Like Zero Gravity?
- From: Philip Deitiker <Nopdeitik@xxxxxxxxxxxx>
- Date: 15 Jun 2005 16:47:11 GMT
In sci.anthropology.paleo, John Roth created a
message ID news:11b05mnq7bti597@xxxxxxxxxxxxxxxxxx:
> To respond to the caption.
>
> No, water is not like zero gravity. NASA, at
> least, does not think so or they would not have
> spent a lot of money on simulating zero gravity
> by having a plane go like a bat out of hell for
> a while and then cutting the power so the
> occupants float.
>
> If all one did was float, yes, the organism might
> lose muscle mass and bone mass, but the same
> can be said for staying in bed all the time.
>
> The best two counterexamples to this piece
> of pseudo-scientific nonsense are: 1. Fish don't
> lose muscle mass and bone density by being in
> water full time. Neither do cetacea nor pinepedia,
> nor the numerous semi-aquatic mammals we know
> of.
>
> 2. Swimming is frequently regarded as the best
> balanced exercise one can do.
>
> John Roth
Gravity is constant, gravitational force varies with the mass
and distance of two massive objects.
To contrast the effect of Weightlessness (which in our context
is the countering affects of centrifugal acceleration and
gravitational force and gravitational forces affect on water.
There is no place in the universe where gravity does not
exist, there are places were otherforces and gravity cancel
each other out. As a matter of fact, the electrostatic force
exherted by the skin on your feet against the earth prevents
one from crashing to the center of the earth, in fact prevents
all mass on the earth from gelling into a single boson.
Go down to the depths of the Mariannas Trench and blow the
hatch on a submarine, that is the effect of gravity on water.
IOW gravity has an effect on water that can be summarized as
pressure resulting from the column height of water and air on
top of a particular point in the water column, about one earth
about 1/3 lb per square inch per foot of water. Blowing the
hatch will be a breif but very informative experiment for the
AA theorist. With the promise of great releif for everyone
else.
Now go into outer space and blow the hatch open on your
spaceship. That is the effect of no gravity on the water
inside your body. The human body exists at 98.6 degrees which
is well below the boiling point of water at standard pressure.
(22.4 moles per liter of gas, about 14 lbs per square inch).
If that pressure is removed as a result of negation of ambient
gravitational force, the atmosphere is released from
gravimetric objects and the pressure drops. The vapor pressure
of water at 98.6' is in excess of the vacuum of space, and the
water at the surface of the skin hottest places begins to
boil, within about 30 seconds the body skin no longer suffices
to retain the desire of bodily fluids to randomize their
positions in space, the Aveoli in the lungs explode and begin
to freeze, the individual dies.
The environment of a space craft is to artificially maintain
pressure in the absense of a gravitating force, such as the
earths mass. Even the earths mass only suffices to hold
livable air to about 18000 feet, beyond which most mammals
cannot survive on an extended basis. For this reason
spacecrafte can achieve a dynamic equilibrium between gravity
and inertia (centrifugal forces) to create an orbit at very
high velocities. The ability to generate such orbits obviates
the presences of atmosphere, and the gravitational attraction
of the spacecraft is negligable in attracting its own gravity.
The result is that any atmosphere is a potentially explosive
force, including the dissolved gases that exist in ones body.
The commonality between water and weightlessness in orbit is
this. In a gravimetrically competitive situation all objects
seek to orient themselves from most dense to less dense. In
air humans are much more dense in air, and therefore we fall
through the air column until we hit something more dense, like
the ground or water. In water humans are heavier or lighter
depending on bone density and lung filling. With lungs filled
we can float. If you exhale an exact amount of air your body
is equal and density to water. The force exherted down by
gravity is equal to the some of all vector forces pushing you
up (or displacing you up) in the water column. IOW the force
of 'bouytancy' has equity with the force of falling.
In orbit the situation is simulated because the centrifugal
force (inertia, omega squared radius) is countered by
gravitational force. The result is a cancelling of forces.
However in space if I were to place a person in a swimming
pool the water would blast into space, leaving the individual
to subsequently explode, or if I were to place the water in a
swimming pool of artificially inducing hyponormal 'gravity' (a
pin wheel station) the individual would be able to breath
easier underwater, would feel very little force of water and
would have a much easier time floating and maintaining
bouyancy. The pressure of the water on lungs and limbs would
disappear.
--
Philip
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