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mass density

mass density - Physics Forum

mass density - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


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  #11  
Old 04-27-2004, 06:53 PM
Xaonon
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Default mass density

Ned i bach <[Only registered users see links. ] >, Donald
G. Shead <[Only registered users see links. ]> teithant i thiw hin:


It applies to any substance with mass and volume. Why are you having so
much trouble with grade-school physics concepts?

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  #12  
Old 04-27-2004, 07:59 PM
Donald G. Shead
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Default mass density

Uncle Al <[Only registered users see links. ].net> wrote in message news:<[Only registered users see links. ].net>...
Cut<

you are a terrible idiot. Contract for a seat in

You are a chemist Uncle Ducaca: Surely you must know what the kg/m^3,
SI mass density applies to: Like how does it compare to the density of
pure water; which I always thought was the standard of density - One
pound divided by one foot per second^2 = one dyne divided by one
centimeter per second^2 = one newton divided by one meter per second
^2 - which is the density to which the density of platinum; lead, and
other things is compared to get their density relative to it: Isn't
that the basis of the hydometer?

Wouldn't a kg/m^3 be about the lightest of all substances? Wouldn't it
not only float on water, but also on the thinest of air? Or have I got
that backwards?
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  #13  
Old 04-27-2004, 09:05 PM
Uncle Al
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Default mass density

"Donald G. Shead" wrote:

Babbling idiot.


Aerogels: limiting density ~ 0.001 g/cm^3.

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There are pictures in case (in case?) you are too stooopid to read the
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  #14  
Old 04-27-2004, 09:18 PM
Paul Cardinale
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Default mass density

[Only registered users see links. ] (Donald G. Shead) wrote in message news:<48402bae.0404270425.243cfa64@posting.google. com>...

Wow. The concept of mass density totally escapes you. You're ten
times dumber than I thought (and I thought you were dumber than dirt).


Because the question is intensively stupid.


Go ahead and ask them. They could use a good laugh.

Paul Cardinale
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  #15  
Old 04-27-2004, 10:38 PM
Gene Nygaard
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Default mass density

On 27 Apr 2004 14:18:18 -0700, [Only registered users see links. ] (Paul
Cardinale) wrote:


I don't know--I suspect that Paul Cardinale might have some
difficulties with it as well.

What's the relationship between density in lb/gal (U.S. liquid) and in
kg/m? Or the mechanical engineers' density in lb/in?


Shead told us once what happened when he did write such a letter. I
got a good laugh out of that!

Gene Nygaard
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  #16  
Old 04-27-2004, 10:46 PM
Gene Nygaard
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Default mass density

On Tue, 27 Apr 2004 17:38:09 -0500, Gene Nygaard <[Only registered users see links. ]>
wrote:


Found it! See Message-ID:
<weY78.12575$[Only registered users see links. ].prodigy .com>

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  #17  
Old 04-28-2004, 01:46 AM
Gregory L. Hansen
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Default mass density

In article <[Only registered users see links. ] >,
Donald G. Shead <[Only registered users see links. ]> wrote:


1 kg/m^3 is about the density of air.

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"And don't skimp on the mayonnaise!"
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  #18  
Old 04-28-2004, 02:27 AM
Donald G. Shead
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Default mass density

[Only registered users see links. ] (Gregory L. Hansen) wrote in message news:<c6lu9p$gck$[Only registered users see links. ].indiana.edu>...

Yes Greg. Even I know that: But the density of various substances
varies with temperature and pressure: The density of platinum at
ordinary temperatures and pressures here on Earth is more than twenty
times that of pure water.

Simply specifying units of density is meaningless: What in the world;
or the whole universe for that matter, has units of One kg/m^3? I'd
like to know!
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  #19  
Old 04-28-2004, 02:50 AM
Sam Wormley
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Default mass density

"Donald G. Shead" wrote:

See Donald--This is where you are ****ed in the head. Of course density
varies with variables like temperature. You seem to think it should be
something other than simply mass per volume. God (if there was one) only
knows why. Every time you pee, your density increases--get over it!
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  #20  
Old 04-28-2004, 03:17 AM
Colin
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Default mass density

In article <[Only registered users see links. ]> ,
[Only registered users see links. ] (Donald G. Shead) wrote:


Does it matter? The SI unit of density is the kg/m^3; every substance
has a value measurable in those units. The units could have been
hundredweight per acre-foot, or ounces (of one kind or another) per
cubic inch. The *relative* densities of different substances would not
be affected thereby. It is irrelevant whether or not there is, in any
particular system, some substance that has a value of 1.0.

As it happens though, at standard pressure and temperature, hydrogen
chloride gas has a density of 1.00045 kg/m^3 (CRC Handbook of Chemistry
& Physics).

Colin.
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