I just went to Google and typed in

 

sqrt(hbar*c^5/G)=

 

and it gave me the natural unit of energy

 

sqrt((hbar * (c^5)) / G) = 1.95627185 × 10^9 joules

 

I typed in this

 

sqrt(hbar*c/G)=

 

and it gave me the natural unit of mass

 

sqrt((hbar * c) / G) = 21.7664598 micrograms

 

I'm impressed.

 

the latter 21.7... micrograms would agree with what the NIST has for Planck mass in its list of fundamental constants.

 

good for Google!

and good for TurricaN for calling our attention to this Google feature.

Urm yes, it also has the gravitational constant, Plancks constant, The Answer To Life The Universe And Everything, speed of light and pi. It probably has many others but it does not have the air speed velocity of an unladen swallow.

 

edit, what I should have mentioned is that you can type all those things as words, and it will give you their values.

Yeah google has lots of stuff like that, its pretty neat.

Tree, Tycho,

 

do you remember that the planck mass is

 

sqrt(hbar*c/G)

 

and if so, how do you remember it?

No, I don't need to remember it since I don't really do physics. I do have it written down on a big pile of papers stapled together full of significant constants from every topic.