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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 centimetre (SI symbol: cm) is a unit of length in the metric system equal to 10−2 metres ( 1 100 m = 0.01 m). To help compare different orders of magnitude, this section lists lengths between 10 −2 m and 10 −1 m (1 cm and 1 dm). 1 cm – 10 millimetres. 1 cm – 0.39 inches. 1 cm – edge of a square of area 1 cm 2.
This is a list of the tallest people, verified by Guinness World Records or other reliable sources. According to the Guinness World Records, the tallest human in recorded history was Robert Wadlow of the United States (1918–1940), who was 272 cm (8 ft 11 in). He received media attention in 1939 when he was measured to be the tallest man in ...
8 ft 11.1 in (272.0 cm) Robert Pershing Wadlow (February 22, 1918 – July 15, 1940), also known as the Alton Giant and the Giant of Illinois, was an American advertiser who was the tallest person in recorded history for whom there is irrefutable evidence. He was born and raised in Alton, Illinois, a small city near St. Louis, Missouri.
1 μm — edge of cube of volume 10 −18 m 3 (one femtolitre) 1–10 μm — diameter of a typical bacterium. 1.55 μm — wavelength of light used in optical fibre. 3–4 μm — size of a typical yeast cell. 5 μm — length of a typical human spermatozoon 's head [22] 6 μm — anthrax spore.
0.3048 m. 30.48 cm. 304.8 mm. The foot (standard symbol: ft) [1][2] is a unit of length in the British imperial and United States customary systems of measurement. The prime symbol, ′, is commonly used to represent the foot. [3] In both customary and imperial units, one foot comprises 12 inches, and one yard comprises three feet.
A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit. All metric prefixes used today are decadic. Each prefix has a unique symbol that is prepended to any unit symbol. The prefix kilo-, for example, may be added to gram to indicate multiplication by one thousand: one kilogram ...
Imperial units. 3.937008 × 10 −9 in. Planck units. 6.187 × 1024 lP. The angstrom[1][2][3][4] (/ ˈæŋstrəm /; [3][5][6] ANG-strəm[5]) is a unit of length equal to 10−10 m; that is, one ten- billionth of a metre, a hundred-millionth of a centimetre, [7] 0.1 nanometre, or 100 picometres. The unit is named after the Swedish physicist ...