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The metre (or meter in US spelling; symbol: m) is the base unit of length in the International System of Units (SI). Since 2019, the metre has been defined as the length of the path travelled by light in vacuum during a time interval of 1 299 792 458 of a second, where the second is defined by a hyperfine transition frequency of caesium.
The entire yellow square is one square mile. The hectare ( / ˈhɛktɛər, - tɑːr /; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100- metre sides (1 hm 2 ), that is, 10,000 square meters (10,000 m 2 ), and is primarily used in the measurement of land. There are 100 hectares in one square kilometre.
The nanometre ( SI symbol: nm) is a unit of length in the metric system equal to 10−9 metres ( 1 1 000 000 000 m = 0.000 000 001 m ). To help compare different orders of magnitude, this section lists lengths between 10 −9 and 10 −8 m (1 nm and 10 nm). 1 nm – diameter of a carbon nanotube.
1 km 2 means one square kilometre, or the area of a square of 1000 m by 1000 m. In other words, an area of 1 000 000 square metres and not 1000 square metres. 2 Mm 3 means two cubic megametres, or the volume of two cubes of 1 000 000 m by 1 000 000 m by 1 000 000 m, i.e. 2 × 10 18 m 3, and not 2 000 000 cubic metres (2 × 10 6 m 3).
Metric units are units based on the metre, ... equal to 1 dyn⋅s⋅cm −3 ... is a unit of area equal to 10 000 m 2 (0.01 km 2). Volume
Square metre. The square metre ( international spelling as used by the International Bureau of Weights and Measures) or square meter ( American spelling) is the unit of area in the International System of Units (SI) with symbol m2. [ 1] It is the area of a square with sides one metre in length. Adding and subtracting SI prefixes creates ...
109.36 yd. 3 937.0 in. The hectometre ( International spelling as used by the International Bureau of Weights and Measures; SI symbol: hm[ 1]) or hectometer ( American spelling) is a unit of length in the International System of Units (SI), equal to one hundred metres [ 2] and to one tenth of a kilometre. The word comes from a combination of ...
The metre is the length equal to 1 650 763.73 wavelengths in vacuum of the radiation corresponding to the transition between the levels 2p 10 and 5d 5 of the krypton 86 atom. The measurement of the wavelength of the krypton line was not made directly against the international prototype metre; instead, the ratio of the wavelength of the krypton ...