Earth measurements

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

It is possible that the UFP does not actually use Earth measurements, but that their usage on screen is an example of "implicit translation" (such as the characters in the film K-19: The Widowmaker speaking English when the viewer understands that they are "speaking" Russian.) This is implied by scenes such as the one where Kirk remarks to Abraham Lincoln that the Enterprise could convert to minutes. (TOS: "The Savage Curtain")

Length

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.

centimeter

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

1 cm ≈ 0.39370 inches.

kilometer

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

1 km ≈ 0.62137 miles.

millimeter

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

1 mm ≈ 0.03937 inches.

Micron

A micron is another name for micrometer (µm), an SI unit of length equal to 1 millionth of a meter (1×10–6 m).

1 mil ≡ 25.4 μm.

Mile

A mile 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 mile ≡ 1.609344 km.

Foot

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

1 foot ≡ 0.3048 m.

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 inch ≡ 2.54 cm.

Light Year

(Main Article: Light year)

One light year is the distance that light travels in one Earth year. It is approximately equal to 9.46e15 meters, or 5.88e12 miles.

Mass

Kilogram

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

In the Imperial units system 1 pound ≡ 0.45359237 kg.

Gram

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

1 ounce ≡ 28.349523 g.

Milligram

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

Volume

Liter

A liter (L or l) is the 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.

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.

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.

cubic meter

During a sensor sweep of the Neutral zone, the USS Enterprise-E found 25 particles of dust per cubic meter. (Star Trek: First Contact)

Units

Gross

A gross is equal to a dozen dozen.