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Planck length. In particle physics and physical cosmology, Planck units are a system of units of measurement defined exclusively in terms of four universal physical constants: c, G, ??, and kB. Expressing one of these physical constants in terms of Planck units yields a numerical value of 1. They are a system of natural units, defined using fundamental properties of nature rather than properties of a chosen prototype object. Originally proposed in 1899 by German physicist Max Planck, they are relevant in research on unified theories such as quantum gravity.

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light-second. The light-second is a unit of length useful in astronomy, telecommunications and relativistic physics. It is defined as the distance that light travels in free space in one second, and is equal to exactly 299792458??m.

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Earth radius. Earth radius is the distance from the center of Earth to a point on or near its surface. Approximating the figure of Earth by an Earth spheroid, the radius ranges from a maximum of about 6,378??km (3,963??mi) to a minimum of nearly 6,357??km (3,950??mi).

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Length

DTP point

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acre. The acre is a unit of land area used in the British imperial and the United States customary systems. It is traditionally defined as the area of one chain by one furlong, which is exactly equal to 10 square chains, 1???640 of a square mile, 4,840 square yards, or 43,560 square feet, and approximately 4,047??m2, or about 40% of a hectare. The acre is sometimes abbreviated ac, but is usually spelled out as the word "acre".

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homestead. A survey township, sometimes called a Congressional township or just township, as used by the United States Public Land Survey System and by Canada's Dominion Land Survey is a nominally-square area of land that is nominally six survey miles on a side. Each 36-square-mile township is divided into 36 sections of one square mile each. The sections can be further subdivided for sale.

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Volume

minim. The minim is a unit of volume in both the imperial and U.S. customary systems of measurement. Specifically, in the imperial system, it is 1???60 of an imperial fluid drachm or 1???480 of an imperial fluid ounce; in the U.S. customary system, it is 1???60 of a US customary fluid dram or 1???480 of a US customary fluid ounce.

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Length

foot. The foot 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. In both customary and imperial units, one foot comprises 12??inches, and one yard comprises three feet. Since an international agreement in 1959, the foot is defined as equal to exactly 0.3048??meters. The most common plural of foot is feet. However, the singular form may be used like a plural when it is preceded by a number, as in "that man is six foot tall". Footage is the term used informally for a length expressed in feet.

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inch. The inch is a unit of length in the British Imperial and the United States customary systems of measurement. It is equal to ???1/36??? yard or ???1/12??? of a foot. Derived from the Roman uncia ("twelfth"), the word inch is also sometimes used to translate similar units in other measurement systems, usually understood as deriving from the width of the human thumb.

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yard. The yard is an English unit of length in both the British imperial and US customary systems of measurement equalling 3??feet or 36??inches. Since 1959 it has been by international agreement standardized as exactly 0.9144??meter. A distance of 1,760??yards is equal to 1 mile.

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thousandth of an inch. A thousandth of an inch is a derived unit of length in a system of units using inches. Equal to 1???1000 of an inch, a thousandth is commonly called a thou or, particularly in North America, a mil.

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pica. The pica is a typographic unit of measure corresponding to approximately 1???6 of an inch. One pica is further divided into 12 points.

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square foot. The square foot is an imperial unit and U.S. customary unit of area, used mainly in the United States, Canada, the United Kingdom, Bangladesh, India, Nepal, Pakistan, Ghana, Liberia, Malaysia, Myanmar, Singapore and Hong Kong. It is defined as the area of a square with sides of 1 foot.

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square inch. A square inch is a unit of area, equal to the area of a square with sides of one inch. The square inch is a common unit of measurement in the United States and the United Kingdom. Pounds per square inch (psi), a unit of pressure, are derived from this unit of area.

unit_gdb_UnitOfArea

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cubic foot. The cubic foot is an imperial and US customary (non-metric) unit of volume, used in the United States and the United Kingdom. It is defined as the volume of a cube with sides of one foot in length, or exactly 28.316846592??L.

unit_gdb_UnitOfVolume

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cubic inch. The cubic inch, sometimes abbreviated cu in, is a unit of volume in the Imperial units and United States customary units systems. It is the volume of a cube with each of its three dimensions being one inch long which is equivalent to ???1/231??? of a US gallon.

unit_gdb_UnitOfVolume

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cubic yard. A cubic yard is an imperial / U.S. customary unit of volume used in Canada and the United States. It is defined as the volume of a cube with sides of 1 yard in length.

unit_gdb_UnitOfVolume

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nautical mile. A nautical mile is a unit of length used in air, marine, and space navigation, and for the definition of territorial waters. Historically, it was defined as the meridian arc length corresponding to one minute of latitude at the equator, so that Earth's polar circumference is very near to 21,600 nautical miles. Today the international nautical mile is defined as exactly 1,852 metres. The derived unit of speed is the knot, one nautical mile per hour.

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mile. The mile, sometimes the international mile or statute mile to distinguish it from other miles, is a British imperial unit and United States customary unit of length; both are based on the older English unit of length equal to 5,280 English feet, or 1,760 yards. The statute mile was standardised as a unit of length between the Commonwealth of Nations and the United States by an international agreement in 1959, when the yard was formally redefined with respect to SI units as 0.9144??metres, making the mile exactly 1609.344 metres. For everyday use, five miles equates roughly to eight kilometres. Mileage is the term used informally for a distance expressed in miles.

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furlong. A furlong is a measure of distance in imperial units and United States customary units equal to one-eighth of a mile, equivalent to any of 660??feet, 220??yards, 40??rods or perches, 10??chains, or approximately 201??metres. It is now mostly confined to use in horse racing, where in many countries it is the standard measurement of race lengths, and agriculture, where it is used to measure rural field lengths and distances specifically in the United Kingdom, Ireland, Canada, and the United States.

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yoctometre. The following are examples of orders of magnitude for different lengths.

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zeptometre. The following are examples of orders of magnitude for different lengths.

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fathom. A fathom is a unit of length in the imperial and U.S. customary systems equal to 6 feet (1.8288??m), used especially for measuring the depth of water. The fathom is neither an international standard (SI) unit, nor an internationally accepted non-SI unit. Historically, it was the maritime measure of depth in the English-speaking world but, apart from within the US, charts now use metres.

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square mile. The square mile is an imperial and US unit of measure for area. One square mile is equal to the area of a square with each side measuring a length of one mile.

unit_gdb_UnitOfArea

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