October 2nd, 2018, 08:51 AM  #11 
Senior Member Joined: May 2015 From: Arlington, VA Posts: 384 Thanks: 27 Math Focus: Number theory 
As per you comment about space 99% empty, virtual particle density in space may be 10^94 gm/cm^3.

October 2nd, 2018, 09:05 AM  #12 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 13,302 Thanks: 935  
October 2nd, 2018, 10:54 AM  #13 
Senior Member Joined: Jun 2015 From: England Posts: 887 Thanks: 266  
October 3rd, 2018, 09:19 AM  #14 
Senior Member Joined: May 2015 From: Arlington, VA Posts: 384 Thanks: 27 Math Focus: Number theory 
The density is pretty much constant. These two values make the greatest anomaly in physics theory, since the experimental value (as for dark energy, dark matter and ordinary matter combined) is only about 10^28 gm/cm^3.

October 3rd, 2018, 09:30 AM  #15 
Senior Member Joined: Jun 2015 From: England Posts: 887 Thanks: 266 
I'm sorry that was not the question. Further the statement that the density is constant effectively says there is a constant 10^94/ 6*10^23 =~ 10^ 70 moles per millilitres of something in space. How do you support that? BTW there are other ways to hide variables. 
October 3rd, 2018, 10:58 AM  #16 
Senior Member Joined: Aug 2012 Posts: 2,044 Thanks: 584  
October 3rd, 2018, 11:18 AM  #17 
Senior Member Joined: Jun 2015 From: England Posts: 887 Thanks: 266 
Yeah, in my day we spelt them with an e. I know it's been dropped sometime in the last 50 years or so. Have you tried spelt on your guy? 
October 4th, 2018, 09:06 AM  #18 
Senior Member Joined: May 2015 From: Arlington, VA Posts: 384 Thanks: 27 Math Focus: Number theory 
The Planck density equals c^5/((hbar)G^2). As you see. it is the [only] density made of fundamental physical constants. Moles are chemical units. Moles per milliliter pales in comparison to Planck density, but it is interesting you put it that way. 
October 4th, 2018, 09:15 AM  #19  
Senior Member Joined: Jun 2015 From: England Posts: 887 Thanks: 266  Quote:
You do realise that 'Planck mass' is a meaningless quantity, not possessed by any known particle, fundamental or otherwise. Therefore anything derived from it has the same visceral quality. Last edited by skipjack; October 5th, 2018 at 12:21 AM.  
October 4th, 2018, 08:19 PM  #20 
Senior Member Joined: May 2015 From: Arlington, VA Posts: 384 Thanks: 27 Math Focus: Number theory 
The Planck density is a logical and simple consequence of the universal radiative constants h, c and G. Is theoretical physics meaningless, like dark energy, dark mass, the Higgs boson and hundreds of other respected constructs? How many originally putative particles, like the neutrino, have since been found in the lab? It's like asking to prove on paper that electrons, real particles in themselves, exist. A rule of reasonability does exist, however. 

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