Earth measurements

Earth measurements are used as the standard units of measure used in the United Federation of Planets.

Meter
A meter (m) is the fundamental SI unit of length, defined as the distance traveled by light in a vacuum in 1/299,792,458 second.

In the Imperial units system 1 foot ≡ 0.3048 m.


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centimeter
A centimeter (cm) is an SI unit of length equal to 1/100 of a meter.

1 cm ≈ 0.39370 inches.


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kilometer
A kilometer (km) is an SI unit of length equal to one thousand meters.

1 km ≈ 0.62137 miles.


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millimeter
A millimeter (mm) is an SI unit of length equal to 1/1,000 of a meter.

1 mm ≈ 0.03937 inches.


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Micron
A micron is another name for micrometer (µm), an SI unit of length equal to 1 millionth of a meter (1 m).

1 mil ≡ 25.4 μm.


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Mile
A mile (mi) was originally one thousand paces, or 5,000 Roman feet (~4,850 Imperial feet). A later British reform changed the mile to 5,280 Imperial feet so that it would equal eight furlongs.

1 mi ≡ 1.609344 km.


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Foot
A foot (ft, plural feet) is an Imperial unit of length equal to twelve inches, or one third of a yard.

1 ft ≡ 0.3048 m.


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Inch
An inch (in) was originally based on the width of the average man's thumb, or the length of three barleycorns. It was later redefined based on SI units.

1 in ≡ 2.54 cm.


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Light year
(Main Article: Light year)

One light year is the distance that light travels in one Earth year. It is approximately equal to 9.46 meters, or 5.88 miles.

Kilogram
A kilogram (kg) is the fundamental SI unit of mass.

In the Imperial units system 1 pound ≡ 0.45359237 kg.


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Gram
A gram (g) is an SI unit of mass equal to 1/1,000 of a kilogram.

1 ounce ≡ 28.349523 g.


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Milligram
A milligram (mg) is an SI unit of mass equal to 1/1,000 of a gram.


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Time
See: Time measurements

Liter
A liter (L or l) is a derived SI unit of volume, equal to 1/1,000 cubic meters (1 cubic decimeter).

In the Imperial units system 1 gallon ≡ 4.54609 L (~277.42 cubic inches).

In the US system, 1 gallon ≡ 231 cubic inches ≡ 3.785411784 l.


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milliliter
A milliliter (ml) is an SI unit of volume equal to 1/1,000 of a liter.

In the Imperial system 1 fluid ounce ≡ 28.4130625 ml.

In the US system, 1 fluid ounce ≡ 29.5735295625 ml.


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cc
A cc (cubic centimeter, official cm3) is a measure of volume equal to one cubic centimeter (cm), which is also equal to one milliliter (ml). The cc is a common term for milliliter used in measuring the dosage of liquid medicines by volume.

1 cubic inch ≡ 16.387964 ml ≡ 16.387964 cc.


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 * See also: Drug dosage

cubic meter
During a sensor sweep of the Neutral zone, the USS Enterprise (NCC-1701-E) found 25 particles of dust per cubic meter. 

Gross
A gross is equal to a dozen dozen.


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Aardse meeteenheid