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

On Wed, 12 Mar 2025 16:21:52 +0000, jerryfriedman wrote:

On Mon, 10 Mar 2025 21:55:47 +0000, Bertitaylor wrote:
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On Mon, 10 Mar 2025 19:16:49 +0000, jerryfriedman wrote:
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On Mon, 10 Mar 2025 3:54:39 +0000, bertitaylor wrote:
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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.

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Still have your old textbooks?

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Yes.
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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.

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It is satisfying to point out the true reason for the evils of this
world.
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You have managed to do that with your deliberate confusion to justify
the evil and wrong theory of relativity accounting for energy formation
by mass destruction - which has absolutely no basis.
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Pressure in all texts is force divided by area. No text says that it is
just the magnitude of the force. All texts say that force is a vector.
In other words, pressure is a vector acting in the same direction of the
applied force.

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Here you have a textbook that says pressure is a
scalar.  I picked one from before Einstein's relativity
so you couldn't fall back on your "true reason".

It is wrong, evidently. Just because it is in print does not make it
correct. There are so many fools and scoundrels who have the money to
print lies and nonsense. Like the physics journals of our time, printing
lies and nonsense, the equivalent to Aristotlean universe view
effectively brought back with thermodynamics, relativity, quantum, etc.
All textbooks say that pressure is force divided by area. We suppose,
even the textbook which wrongly says pressure is scalar.
 As force is a vector, pressure is also a vector. Has to be. However the
magnitude of pressure is a scalar. Just as the magnitude of the velocity
vector is the scalar known as speed.
Inferior minds can get confused by the usage of the term pressure when
just its magnitude is considered. Usually that is the case like tire
pressure. Like we say speed of a plane, not its velocity, normally.
But pressure has to be exerted in a given direction, that of the force,
so as it has direction it is a vector.
Hope this enters pedantic minds, though  not holding our breaths.
Woof woof woof-woof woof woof-woof
Bertietaylor (Arindam's celestial cyberdogs, educating academics)

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https://books.google.com/books?id=b51RAAAAMAAJ&pg=PA257#v=onepage&q&f=false
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You will not find a textbook that says pressure is a
vector or writes pressure using its notation for
vectors or refers to the components of a pressure
vector.  You probably will find or have found one
that says in words "pressure is force divided by
area" or something similar, not realizing that some
students could misinterpret that as saying pressure
is a vector, but it's pretty certain that the book
will get the equations right.
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When we say tire pressure is so much, that means there is so much force
acting normally on the tire wall per square inch.

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That's true.  The magnitude of the force is given by
the pressure and the area, both scalars, and the
direction of the force vector is normal to the tire wall.
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So it is a vector all
right even though it may sound like a scalar. Like velocity is a vector
but speed is a scalar even though they are dimensionally same.

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No, it's a scalar even though it may sound like a
vector.
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 You may have to read
carefully and even pay attention to typefaces.  The
textbooks I have use italic for vectors and boldface
for scalars.

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Irrelevant and dishonest.

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Relevant--that's how books distinguish between
vectors and scalars--and true.
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--
Jerry Friedman
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