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# Hectometre

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### Hectometre

1 hectometre =
SI units
0.10000 km 100.00 m
US customary / Imperial units
109.36 yd 328.08 ft

The hectometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: hm) or hectometer (American spelling) is an uncommonly used unit of length in the metric system, equal to one hundred metres. It derives from the Greek word "ekato", meaning "hundred". A regulation football or soccer field is approximately 1 hectometre in length.

• For area the square hectometer (hm2) is a common unit. It is more commonly known by the name of hectare (ha), meaning 100 ares (100 a). The are is a measurement of area the size of 1 decametre by 1 decametre, which is 10 metres by 10 metres. Hence 100 ares equals an area with dimensions 100 m by 100 m — 1 hectometre by 1 hectometre, the square hectometre — equalling 10,000 square metres (10,000 m2)
• For volumes the cubic hectometre (hm3) is also used, 100 m by 100 m by 100 m equalling 1,000,000 cubic metres (1,000,000 m3).
A clickable mosaic of objects
at scales within direct human experience, from the micrometric (106 m, top left) to the multi-kilometric (105 m, bottom right).
The Pyramid of Cheops is 138.8 metres high.
British driver location sign and location marker post on the M27 in Hampshire. The location marker posts are installed at 100-metre intervals[1]

To compare different orders of magnitude this page lists lengths between 100 metres and 1000 metres (1 kilometre).

## Contents

• Conversions 1
• Human-defined scales and structures 2
• Sports 3
• Nature 4
• Astronomical 5
• Notes 6

## Conversions

100 metres (sometimes termed a hectometre) is equal to:

• 328 feet
• one side of a 1 hectare square
• a fifth of a modern li, a Chinese unit of measurement
• the approximate distance travelled by light in 300 nanoseconds.

## Nature

• 115.5 metres — height of the world's tallest tree in 2007, the Hyperion sequoia[6]
• 310 metres — maximum depth of Lake Geneva
• 340 metres — distance sound travels in air at sea level in one second; see speed of sound
• 979 metres — height of the Salto Angel, the world's highest free-falling waterfall (Venezuela)

## Notes

1. ^ Highways Agency. "Driver Location Signs - Frequently Asked Questions". Retrieved 2010-02-10.
2. ^ "Kingda Ka (Six Flags Great Adventure)". Archived from the original on 25 April 2009. Retrieved 2009-04-18.
3. ^ "Tour Eiffel". Retrieved 15 September 2010.
4. ^ "Burj Dubai all set for 09/09/09 soft opening". Emirates Business 24-7. Archived from the original on 19 January 2009. Retrieved 17 January 2009.
5. ^ The Laws of The Game
6. ^ http://www.monumentaltrees.com/en/trees/coastredwood/coastredwood/
7. ^ Fujiwara, Akira; et al. (2 June 2006). "The Rubble-Pile Asteroid Itokawa as Observed by Hayabusa". Science 312 (5778): 1330–1334.
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