This system is used commonly in Britain and the countries that were under its rule. However, the SI decision was to say that 1000 grams or a kilogram was fundamental. 3. In addition, some physicists recognize electric charge as a separate fundamental dimension of physical quantity, even if it has been expressed in terms of mass, length, and time in unit systems such as the electrostatic cgs system. Units of speed, force, momentum etc. You measure things by defining a standard unit and then stating the measurement in terms of multiples of that unit. Another way of saying this is that. Other quantities, called derived quantities, are defined in terms of the seven base quantities via a system of quantity equations. 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 meter apart in a vacuum, would produce between these conductors a force equal to 2 × 10−7 newton per meter of length.". The common system of units utilized in mechanics are as follows: The f.p.s or Foot-Pound System: A British engineering system of units that uses the foot as the unit of measurement of length, and pound as the unit of mass and second as the unit of time. by Ron Kurtus (revised 18 June 2013) You measure things by defining a standard unit and then stating the measurement in terms of multiples of that unit. The quantities which we can measure directly or indirectly are known as physical quantities. SI system: The SI system or the International system of standards has now replaced all the systems of measurement. These are as follows: The Cubit - This measurement originated in Egypt about 3000 B.C. We still use this to measure the height of horses. units_fundamental.htm. In our above example, the length of the rod is the fundamental physical quantity. The units of measurement should possess following qualities: The unit of measurement of the physical quantity should be invariable. Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Pinterest (Opens in new window), Click to share on Reddit (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Tumblr (Opens in new window), Compulsory English BA second year 2069 | Questions answer Group B, Computer Operator – Set 9 | Lok Sewa Aayog | Objective Questions. long arc subtends an angle of 1”. Ө = 1/60 min  = 1/60 x 60 degree = 1/60 x 60 x π/180 radian, Since the radius of an arc, r = length of an arc (l)/angle subtended (Ө), Therefore, 1 parsec = 1 A.U./1 sec = (1.496 x 1011) x (60 x 60 x 180)/(π).

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