# I need help with a calculation please

1. Jul 8, 2006

### Chaos' lil bro Order

Greetings,

I was thinking about Cosmology and Omega-Matter. The critical density of the Universe is equal to about 6 Hydrogen atoms/ meter cubed. If we were to smear a human body out to fit it to this density, how big a volume would the human body smear out to be?

Assume, the human body occupies a volume of ~1 meter cubed

Assume, the average Mol. in the human body is 6,6-Carbon

Can anyone figure this out? It seems like a fun way to gain perspective on just how undense the Universe is.

P.S. Really our best WMAP data says the Universe's matter density is closer to 0.27 x 6 Hydrogen atoms. If we exclude dark matter, this number gets even smaller and becomes 0.04 x 6 Hydrogen atoms/ meter cubed.

2. Sep 12, 2006

### Chaos' lil bro Order

'any ideas folks?'

3. Sep 19, 2006

### Gokul43201

Staff Emeritus
'A cube of side about 3 light-seconds (10^9m).'

4. Oct 17, 2006

### Chaos' lil bro Order

'I guess no one likes this idea, lol.'