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# What is the standard mass-density of a cubic decimeter of pure water?

## What is the standard mass-density of a cubic decimeter of pure water? - Physics Forum

### What is the standard mass-density of a cubic decimeter of pure water? - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.

#31
07-15-2005, 07:43 PM
 Gene Nygaard Guest Posts: n/a
What is the standard mass-density of a cubic decimeter of pure water?

Sam Wormley wrote:

What's your point? That's the same number I gave you, isn't it? It
differs from what Eric Weisstein gave, to the precision to which he
gave it, doesn't it?

1.00000 g/cm³
0.99997 g/cm³
-------------
0.00003 g/cm³

Did you forget that according to the general rules of mathematics,
trailing zeros after the decimal point are supposed to be significant?

Do you remember when 1 ml was 1.000028 cm³? Or the earlier value
used, 1.000027 cm³? Do you know why that was? Hint: look up the 1901
redefinition of the litre.

Invert those numbers and see what you get.

Why in the world do you suppose the litre was redefined?

This is indeed a well known, generally accepted fact, Sam. Just admit
that you quoted a source which was incorrect.

Gene Nygaard.

#32
07-15-2005, 08:53 PM
 freddy osbourne Guest Posts: n/a
What is the standard mass-density of a cubic decimeter of pure water?

according to schaums outline contiunuum mechanices....the amount of mass
occupying a volume V at time t is given by the integral m=int(ro(x,t)dV) in
which ro(x,t) isa contiuous function fo coordinates called mass density...
"Puppet_Sock" <[Only registered users see links. ]> wrote in message

 Tags cubic , decimeter , massdensity , pure , standard , water

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