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Historic film speed conversion table, 1952 [70] Classic camera Tessina with exposure guide, late 1950s. As discussed in the ASA and DIN sections, the definition of the ASA and DIN scales changed several times in the 1950s up into the early 1960s making it necessary to convert between the different scales.
Speed; system unit code (alternative) symbol or abbrev. notes sample default conversion combinations SI: metre per second: m/s m/s US spelling: meter per second 1.0 m/s (3.3 ft/s)
statvolt (CGS unit) statV. ≘ c ⋅ (1 μJ/A⋅m) = 299.792458V. volt (SI unit) V. The difference in electric potential across two points along a conducting wire carrying one ampere of constant current when the power dissipated between the points equals one watt. [ 32 ] = 1 V = 1 W/A = 1 kg⋅m2/ (A⋅s3) = 1 J/C.
H – the speed index, this means the maximum permitted speed, here 210 km/h (130 mph) The tires on a Hummer H1 might be labeled: 37X12.5R17LT. 37 – the tire is 37 in (940 mm) in diameter; 12.5 – the tire has a cross section of 12.5 in (320 mm) R – this is a radial tire; 17 – this tire fits 17 in (430 mm) rims
The conversion between different SI units for one and the same physical quantity is always through a power of ten. This is why the SI (and metric systems more generally) are called decimal systems of measurement units. [10] The grouping formed by a prefix symbol attached to a unit symbol (e.g. ' km ', ' cm ') constitutes a new inseparable unit ...
Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property ...
Swedish 30 km/h speed limit – the yellow background provides a contrast in case snow covers the background against which one perceives the road sign. [ 39 ] Since the text "km/h" on this Irish speed limit sign is a symbol, not an abbreviation, it represents both "kilometres per hour" (English) and " ciliméadar san uair " ( Irish ) [ 40 ]
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