By Donald Fenna
This finished and authoritative dictionary offers transparent definitions of devices, prefixes, and varieties of weights and measures in the Systeme overseas (SI), in addition to conventional, and industry-specific devices. it is usually normal historic and clinical historical past, overlaying the improvement of the sequential definitions and sizing of devices. This new reference paintings will turn out priceless to expert scientists, engineers, technicians in addition to to scholars and the final person.
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Extra resources for A Dictionary of Weights, Measures, and Units
Centigrade heat unit See Celsius heat unit. Centigrade scale See Celsius. '115' centimeter, centimetre [centi- + metre] length Symbol cm. e. s. system. See also electromagnetic centimetre; electrostatic centimetre. s. system. 006 955~; for frequencies/! 193- x loglo (/2/ji). Compare cent, which has 100 units to the semitone, 1200 to the octave. centner massBI See cental. centrad [centi-radian] plane angle 155 rad, particularly for diffraction of light by a prism. century [Lat: 'hundred'] time 100 years.
Box mass UK 1975 For herrings, = 25 kg = \ herring unit. Boyle, boyle [R. Boyle; Ireland. UK 1627-91] pressure See deciboyle. BP [Before the Present] time An acultural measure into the past, 31 British Imperial system expressed in years. g. in the tgeochronologic scale). s. Bytes per second. s. s. Bits per second; see also baud. s. Bq radiation physics SI See becquerel; see also SI alphabet for prefixes. brewster [D. Brewster; UK 1781-1868] optics. Symbol B. Originally coined for the unit '10~10 cm2 per gramme weight' '24' in 1910, for the expression of stress-optical coefficients, the brewster is now regarded as 10~12m2 -N"1.
1948 9th CGPM 'candela' adopted in place of (new) candle. 1967-68 13th CGPM: 'decides to express the definition of the candela as follows: The candela is the luminous intensity, in the perpendicular direction, of a surface of m<^m square metre of a black body at the temperature of freezing platinum under a pressure of 101 325 newtons per square metre'. 1979 16th CGPM: 'decides 1. The candela is the luminous intensity, in agiven direction, of a source that emits monochromatic radiation of a frequency 540 xlO12 hertz and that has a radiant intensity in that direction of gg watt per steradian.
A Dictionary of Weights, Measures, and Units by Donald Fenna