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universal constant comparison table

Subject	has effect on other constant	has unit	has relationship	has uncertainty	has equation	has definition	has symbol	has value	is an instance of
characteristic impedance of vacuum		Ω		0			Z0	376.730313461 Ω	resistance
electric constant				0			ε0	8.854187817 × 10-12 F m-1	universal constant
Gaussian gravitational constant						The constant defining the astronomical system of units of length (astronomical unit), mass (solar mass) and time (day), by means of Kepler's third law. The dimensions of k2 are those of Newton's constant of gravitation: L3M-1T-2.	k	0.01720209895	universal constant
magnetic constant				0			μ0	4π × 10-7 = 12.566 370 614 × 10-7 N A-2	universal constant
Newtonian constant of gravitation	none, increases in the accuracy of its measurement have made no difference to the values of the other physical constants.		no direct connection has, as yet, been established between G and any other physical quantities	0.010 × 10-11 m3 kg-1 s-2	F = G × m1 × m2/r2, where F is the gravitational force of attraction, m1 and m2 are the masses for two bodies separated by r.	The universal constant of proportionality in the attraction between two unit masses a unit distance apart.	G	6.673 × 10-11 m3 kg-1 s-2	universal constant
Planck constant				0.00000052 × 10-34 J s		A universal constant of nature that measures the magnitude of quantum mechanical effects.	h	6.62606876 × 10-34 J s	universal constant
Planck length		length unit		0.0012 × 10-35 m		The scale below which quantum fluctuations in the fabric of spacetime would become enormous. The size of a typical string in string theory.	lP	1.6160 × 10-35 m	length
Planck mass		mass unit		0.0016 × 10-8 kg		About ten billion billion times the mass of a proton; about one-hundredth of a thousandth of a gram; about the mass of a small grain of dust. The typical mass equivalent of a vibrating string in string theory.	mP	2.1767 × 10-8 kg	mass
Planck time		time unit		0.0040 × 10-44 s			tP	5.3906 × 10-44 s	time
speed of light in vacuum				0			c	299792458 m s-1	universal constant

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