sci.chem Google Group

Gas Cylinders - why dont heavier components sink to the bottom?

2009-12-24T20:56:25Z

all good firemen know that flammable liquid vapours are heavier than
air and will sink to low points in drains etc, yet how come I can
purchase a certified standard gas mixture consisting of 5% propane in
air in a cylinder. Why doesnt the propane sink to the bottom of the
cylinder ( even partly) to give much less than 5% at the top

Re: Obsticales to scientific progress

2009-12-24T20:29:53Z

In article <ac61b4fe-fa92-4109-ad91-b7db5 73c8ba2
@b2g2000yqi.googlegroups.com>, sent to sci.physics on Sun, 20 Dec 2009
00:21:24 -0800 (PST), Y.Porat <y.y.po...@gmail.com> imparted these words
of wisdom:
Hey, Tony, why have you started calling me Igor? Is that your boyfriends
name?

Re: Obsticales to scientific progress

2009-12-24T20:29:02Z

In article <97009d25-4c47-4dcc-892e-b76c6 3ac9289
@g26g2000yqe.googlegroups.com> , sent to sci.physics on Sun, 20 Dec 2009
02:33:09 -0800 (PST), Y.Porat <y.y.po...@gmail.com> imparted these words
of wisdom:
I am a contracted consultant working in various large, multinational,
organisations.
Why do you ask?

Re: Questions about Forces?

2009-12-24T03:24:23Z

I can be wrong but you can clear it.

Re: Questions about Forces?

2009-12-24T03:22:23Z

Because in calculation, center point of any substance is consdered. If
we draw a straight line in center of a wave, it can express as I
thought.

Re: Questions about Forces?

2009-12-24T03:18:45Z

I think you meant both kinetic & potential energy. Thanks.

Re: Questions about Forces?

2009-12-24T03:17:15Z

Thanks. Are we trying to know one force (unification) over all ?

Call for Papers & Sessions: The 2010 International Conference on Scientific Computing (CSC'10), USA, July 2010

2009-12-24T02:17:44Z

It would be greatly appreciated if this announcement could be
shared with individuals whose research interests include
scientific computing. Thanks.
-------
CALL FOR PAPERS
and
Call For Workshop/Session Proposals
CSC'10

Re: Questions about Forces?

2009-12-23T23:44:43Z

There is a point for each body, that, to simplify calculus, can be
considered to have the whole mass of the body, and the gravity field OUTSIDE
the body is equivalent to that of the body.

Re: Questions about Forces?

2009-12-23T23:41:25Z

At the center of the earth, gravity is zero. But the stick has a velocity.
When you dropped it, velocity was 0 and potential energy was GMm/r. At the
center, all the initial potential energy is transformed into kinetic energy,
so K=(1/2)mv^2=GMm/r, thus v=sqrt(2GM/r). As the forces are null, and it has

Re: Questions about Forces?

2009-12-23T23:39:14Z

Dear Kumar:
Now you get to an interesting question! I mean there is kinetic
energy that is "naturally" confined to a small space. This kinetic
energy can be tapped, just like it was potential energy. But does
gravitation arise from the "field" that also makes inertia... I don't
know.
I am not Newton. You should do your own search.

Re: Questions about Forces?

2009-12-23T23:31:27Z

Dear Kumar:
...
I see the question mark, but I don't see the question. *You*
established that there was a bottle, and that it was closed. So *you*
made it "resist pressure & air".
David A. Smith

Re: Thermodynamic Changes on Potential Energy?

2009-12-23T22:31:25Z

In thermodynamics, the metric for thermodynamic equilibrium is the
amount of entropy. The conventional theory is that the global entropy
has to increase, it can never decrease. The conventional theory says
that it will increase until it can't increase anymore.
However, the local entropy density can decrease. This is a

Re: What happens if I mix ascorbic acid with glycerol?

2009-12-23T20:52:04Z

DMSO has the unusual property of making the
skin permeable to rather large molecules.
This caused a problem at Crown Zellerbach
where they were researching things to do
with DMSO. They found it was a great
solvent for cleaning glassware, but they
were dealing with a lot of tars from wood
distillation and soon discovered that

Re: Questions about Forces?

2009-12-23T20:01:00Z

It doesn't. What makes you think it does?