Care is needed not to confuse symbols with units of length or time. One arcsecond is a very small angle: there are 1 296 000 seconds in a circle. The SI recommends ' as the symbol for arcminute.Ī unit of angle measure, also called the second of arc, equal to 1/60 arcminute. Angstrom unit named after the Swedish physicist Anders Jon Ångström (1814-1874) and is used most often to measure extremely small lengths like the wave length of light.Ī unit of angle measurement, also called the minute of arc, equal to 60 arcseconds and to 1/60 degree. The SI derived unit of magnetic field strength.Ī metric unit of length, equal to 0.1 nanometre or 10 -10 metre. This is equivalent to exactly 3600 coulomb. One ampere hour is the charge accumulated by a steady flow of one ampere for one hour. The ampere is defined as the constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 metre apart in vacuum, would produce between these conductors a force equal to 2 x 10 -7 newton per metre of length.Ī unit of electric charge often used to state the capacity of a battery. The SI base unit of electric current, named after the French physicist André-Marie Ampère (1775-1836). One acre is equal to 0.404 687 3 hectare. In metric the unit corresponding to the acre is the hectare, which is 10,000 square metre. The acre was defined as the area of a field one furlong long by 1/10 furlong wide. The acre (old English word meaning field) was originally defined as the area that could be plowed in a day by a yoke of oxen. Īn old unit of area used for measuring the area of land. The A to Z hyperlinks may assist in finding that unit of measurement.Ī B C D E F G H I J K L M N O P Q R S T U V W X Y Z The following glossary of SI units and other units is far from complete, but does cover the main units used today and all the units used on this web site.
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