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you are here : HoloGuides Home >> Knowledge >> units

	A-Z
	A
	[A] Ampere (electrical current)
	[AU] astronomical unit (length)
	C
	[°C] Celsius (temperature)
	[cd] candela (luminous intensity)
	D
	[day] (time)
	F
	[F] Farad (capacity)
	[°F] Fahrenheit (temperature)
	G
	[g] gram (mass)
	H
	[hour] (time)
	[Hz] Hertz (frequency)
	K
	[K] Kelvin (temperature)
	L
	[lightyear] (length)
	M
	[m] meter (length) history of definition NIST
	[mi] mile (length)
	M
	[mol] mol (amount of substance)
	O
	[Ohm, greek letter] Ohm (electrical resistance)
	S
	[s] second (time) definition NIST
	P
	[pc] parsec (length)
	V
	[V] Volt (electrical tension)
	W
	[W] Watt [power]
	Y
	[year] (time)


May 6, 2002

This page created


Oct 20, 1983

1 meter [m] = distance traveled by light in vaccum
in 1 second [s] divided by 299 792 458


Oct 14. 1960

conference to re-define some units

1 meter [m] = 1 650 763.73 times the wavelength
of light resulting from the unperturbated
transition 2p₁₀ 5d₅of isotop Kr 86


1889

1 meter [m] defined as distance between two graduation lines on
an x-shaped Platinum-Iridium prototype bar at 0 [°C]

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