Re: The antics of thermodynamics, the depravity of relativity, the bunkum of quantum

On Mon, 10 Mar 2025 3:54:39 +0000, bertitaylor wrote:

On Sun, 9 Mar 2025 9:50:06 +0000, Peter Moylan wrote:
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On 09/03/25 09:58, Phil wrote:

On 08/03/2025 22:46, Bertietaylor wrote:

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It's just as implausible as the suggestion (easily disproved)
that the pressure is zero at the centre of the earth.

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The pressure is most certainly zero at the centre of the stars
and planets. Read a first year book on physics.

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Which will say that within an enclosed surface with mass the net
gravitational force or pressure is zero.

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Read that first year book yourself. Did you find the words "or
pressure"?

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You must have been a lousy student in school, Moylan. Did you not learn
there that Pressure = Force/Area, Where the area involved is
perpendicular to the force?  So if force is say 10 newtons ACTS
UNIFORMLY upon an immovable area of 1 square meter, then the pressure
upon that surface is 10 newtons per square meter.
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No, I didn't think so. You've tried to conclude something

about the pressure from the gravitational force. That doesn't work,
because they are different quantities.

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Don't be a bigger fool than you can help, Moylan. Read above. Basically
if there is no force, there cannot be any pressure. As there is no force
from gravity at the centre of the Earth/sun, there cannot be any
pressure there.
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So pressure = force/area. When force = 0, pressure = 0.
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Think you can get this?
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Gravitational force, like all forces, is a vector quantity. It has a
magnitude and a direction. That makes it possible that a number of
nonzero vectors can sum to zero; and, indeed, that is what happens
inside a spherical shell.

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Right.
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Pressure is a scalar.

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No. Which ***idiot*** told you that????
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Okay, let us do some school level physics (what Arindam was taught in
Std 8)
Pressure is force/area.  (Fundamental school level education, useful in
hydraulics, which Arindam learnt in Std 9).
Force is a vector
Area is a scalar, when by convention its orientation is perpendicular to
the force.
The division of a vector by a scalar is a vector.
So pressure is a VECTOR.

..
Still have your old textbooks?  Or access on line or
in person to any textbook you trust?  You should find
that it says pressure is the /magnitude/ of force over
area, which is a scalar.  You may have to read
carefully and even pay attention to typefaces.  The
textbooks I have use italic for vectors and boldface
for scalars.
--
Jerry Friedman
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