Astronomy   View all facts   Glossary   Help

abstraction > mathematical concept > unit > non SI unit

non SI unit comparison table

Subject	has equivalent	is named after	has definition	has value	has symbol	has synonym	has value in SI unit	is equivalent to	is a kind of	is an instance of	is a unit of
angstrom	10-10 meters	Anders Jonas Angstrom (1814-1874)	A unit of length used when expressing wavelengths.		Å					non SI unit	length
astronomical unit			The radius of a circular orbit in which a body of negligible mass, and free of perturbations, would revolve around the Sun in 2π / k days, where k is the Gaussian gravitational constant. This is slightly less than the semi-major axis of the Earth's orbit.		AU		1 au = 1.49598 × 1011 m, approximately			non SI unit	length
bel					B		(1/2) ln 10 Np			non SI unit
day			An interval of 86400.51 seconds, unless otherwise indicated.	86400.51 seconds	d		24 h = 86400 s		non SI unit		time
degree (angle)					°		(π/180) rad			non SI unit
electron volt	160.219 × 10-21 joule		Unit of energy used in atomic and nuclear physics; the kinetic energy acquired by one electron in passing through a potential difference of 1 volt in vacuum. Sometimes used as a unit of mass (see rest-mass energy)		eV			1.6 × 10-19 joules		non SI unit	energy
hour					h		60 min = 3600 s			non SI unit
liter					L		1 dm3 = 10-3 m3			non SI unit
metric ton					t		103 kg			non SI unit
minute (angle)					'	arc minute	(1/60)° = (π/10800) rad			non SI unit
minute (time)					min		60 s			non SI unit
neper					Np		1			non SI unit
second (angle)					"	arc second	(1/60)' = (π/648000) rad			non SI unit
unified atomic mass unit					u		1.66054 × 10-27 kg, approximately			non SI unit

Next unit: power unit    Up: unit    Previous unit: natural unit