Conductance quantum
	E Q U A T I O N S
		A times B
		1		Bohr radius		Boltzmann		2.530826
		2		char imped of vac		2		0.069229
		3		light		8 pi		0.069229
		4		light squared		molar gas constnt		3.131264
		5		Thompson cross		rd ed 1 total srf		0.178368
		6		Boltzmann		4		2.271991
		7		classical elct rd		Boltzmann squared		4.467062
		8
		9
		10
		A divided by B
		1		2 pi squared		von Klitzing		-1.303956
		2		2pi / Planck		permeability magn		-2.688008
		3		4 pi squared		sphere diam 1		-2.688008
		4		light squared		first radiaton sr		-2.473999
		5		Newtonian gravtat		permittivity elec		-2.822604
		6		permeability magn		proton mass kg		-3.034461
		7		2 pi		sphere diam 1		-2.688008
		8		8 pi		molar gas constnt		0.220277
		9		light		first radiaton sr		-2.473999
		10		Newtonian gravtat		Avogardo's number		-4.748519
		11		quantum circulutn		Nccp squared / pi		-2.688008
		12
		13
		14
		15
		16
		17
		18
		19
		20
				It appears when measuring the conductance of a quantum point contact.
				highligted		derivative		nist
				copyright   steve waterman   january 2009