Template:Base quantities and count

Base quantity	Symbol for quantity	Symbol for dimension	Name of SI unit	Symbol for SI unit
length	l	L	meter	m
mass	m	M	kilogram	kg
time	t	T	second	s
electric current	I	I	ampere	A
thermodynamic temperature	T	Θ	kelvin	K
amount of substance *,§	n = N·NA-1	N	mole	mol
count *,$	N	X	counting unit	x
charge *,€	Q = N·e = n·F	I·T	coulomb	C = A·s
luminous intensity	Iv	J	candela	cd

^* For the quantities n, N and Q, the entities X have to be specified in the text or indicated by a subscript or in parentheses: n_X; N_X; Q_X.

^§ 'Amount is a counting quantity, converting the counting unit [x] into moles [mol] using the Avogadro constant, N_A.

^$ 'Count' is synonymous with 'number of counting entities'. In the SI, the quantity 'count' is explicitly considered as an exception: "Each of the seven base quantities used in the SI is regarded as having its own dimension. .. All other quantities, with the exception of counts, are derived quantities" (Bureau International des Poids et Mesures 2019 The International System of Units (SI)).

^€ Charge is a derived SI quantity, included here for comparison. Charge is a counting quantity, converting the counting unit [x] into coulombs [C] using the elementary charge, e, or converting moles [mol] into coulombs [C] using the Faraday constant, F.