On Sunday, January 6, 2019 at 2:59:39 PM UTC, John Clark wrote:
> There is a related concept, the Planck Mass that also involves the 3 most 
> fundamental constants in nature, the speed of light the Planck constant and 
> the Gravitational constant. If you take the Planck energy 
> (c^5*h/2*PI*G)^1/2 and confine it in a box one Planck length 
> (G*h/2*PI*c^3)^1/2 on a side it will turn into a Black Hole. To find the 
> Planck Mass we use E=MC^2 and divide the Planck Energy by c^2. The Planck 
> Mass works out to be .02 milligrams, about the mass of a single grain of 
> salt; nothing less massive than the Planck Mass can form a Black Hole 
> regardless of how much you compress it. Some, such as Roger Penrose, 
> think this marks the boundary between the quantum realm and the realm of 
> classical physics but most think that's a oversimplification.
>  John K Clark  

*How does one calculate Planck length using the fundamental constants G, h, 
and c, and having calculated it, how does one show that measuring a length 
that small with photons of the same approximate wave length, would result 
in a black hole? TIA, AG *


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