≡ 5 280 US Survey feet ≡ ( 5 280 × 1 200∕ 3 937) mĭistance of star with parallax shift of one arc second from a base of one astronomical unit Ken Watanbe, former McKinsey consultant and author of Problem Solving 101, teaches. ≈ 1∕ 10 000 000 of the distance from equator to pole. Solving Force Problems in Physics using vectors The following are. ≡ Distance light travels in 1∕ 299 792 458 of a second in vacuum.
≡ Distance light travels in vacuum in 365.25 days ≡ Distance light travels in one second in vacuum Legally defined as 1.033 English feet in 1859 Indicates that digits repeat infinitely (e.g. For each physical quantity, a number of different units (some only of historical interest) are shown and expressed in terms of the corresponding SI unit. This article gives lists of conversion factors for each of a number of physical quantities, which are listed in the index. Within each table, the units are listed alphabetically, and the SI units (base or derived) are highlighted. Exceptions are made if the unit is commonly known by another name (for example, 1 micron = 10 −6 meter). Nominal values are sometimes allowed and used.Ĭonversion between units in the metric system can be discerned by their prefixes for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article. It sometimes involves a slightly different configuration, or size substitution, of the item. It changes the measurement to convenient and workable numbers and units in the new system. It does not involve changing the physical configuration of the item being measured.īy contrast, a hard conversion or an adaptive conversion may not be exactly equivalent. This is sometimes called soft conversion. Some conversions from one system of units to another need to be exact, without increasing or decreasing the precision of the first measurement.
3.1 General commercial sources of converters.2.24 Electromotive force, electric potential difference.