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Physics Constants

Speed of Light  
Conductance Quantum 
Gravitational Constant (G) 
Electric constant 
Plank's Constant  
Plank's Length  

Newtonian constant of gravitation 
Magnetic constant 
Molar gas constant 
Molar volume of gas 
Sackur-Tetrode constant 
Plank's Mass 

Mathematical Constants

Golden Ratio  
Euler Mascheroni Constant  
Meissel Mertens Constants 
Omega Constant 
Cahen's Constant 
Landau Ramanunjan Constants  
Alladi Grinstead Constant  
Catalan's Constants 
Apery's Constants 

Conway's Constants 
Mill's Constant 
Plastic COnstants 
Ramanunjan Soldner Constants 
Porter Constants 
Universal Parabolic Constant 
Kinchin's Constants 
Niven's Constant