How do you convert cgs unit of density into mks system. The centimetre gram second system of units abbreviated cgs or cgs is a variant of the metric system based on the centimetre as the unit of length, the gram as the unit of mass, and the second as the unit of time. What is the difference between cgs system and mks system. Apart from the mks system, there were others such as the cgs unit sys tem based on centimeter cm, gram g, second s, and the gravity unit system based on a. The cgs system is based on three basic quantities for length, mass, and time using the centimete r, gram and second, respectivel y. It is always the same for mechanical units, but there are several variants of electric additions. All units and their symbols should be written in small case letters e.
In the cgs system, force and ene r gy are quantified with the derived units of dyne g cms 2 and e r g g cm 2 s 2, respectivel y. The units package also knows the dimensions of all standard quantities, for example area, frequency, torque, etc. Gaussian units use the cgs centimetergramsecondsystem. Description of units mechanical units quantity length mass time force work, energy power dynamic viscosity kinematic viscosity cgs centimeter gram second dyne erg. Electric and magnetic units the esu and emu unit systems are cgs systems. In physics, there are various terms and quantities. You may also want to check out these topics given below. Conversion between these base units and all the derived units are quite simply given by an appropriate power of 10. Fundamental units, supplementary units, cgs, fps and mks units in hindi for sscbankspcs and others exam in hindi subscribe my channe. United states department of commerce, national institute of standards and technology, 2001. Gaussian units constitute a metric system of physical units. Let s consider the example of the speed or velocity of the body.
It is also called the gaussian unit system, gaussiancgs units, or often just cgs units. Gaussian units and cgs emu are the same for magnetic properties. The mks system was the original french mercantile system, circa 1795. The comparison of an unknown quantity with a known fixed quantity of the same kind in called measurement. This is because the multiplies and submultiplies of their basic units are related to the practical units by powers of 10.
In 1939, the cce recommended the adoption of a system of units based on the meter, kilogram, second, and ampere. Since the derived units depend on the fundamental units, they also change in different systems of measurement. The cgs unit of pressure is barye ba, equal to 1 dyncm. Full names of the units, even when they are named after a scientist should not be written with a. Appendix c some basic formulas of physics mks and cgs units. The centimetregramsecond system of units abbreviated cgs or cgs is a variant of the. Now, this system of units has replaced all other systems of units in all branches of science, engineering, industry, and technology. Students who want to excel in physics must know the cgs. Measurement without units of a physical quantity has no meaning. The two systems differ only in the scale of two out of the three base units centimetre versus metre and gram versus kilogram, respectively, while the third unit second as the unit of time is the same in both systems. This system is the most common of the several electromagnetic unit systems based on cgs centimetregramsecond units.
Appendix c some basic formulas of physics mks and cgs. The different quantities in physics can be expressed in various units. Here are some examples of units you may encounter, the relevant facts about them, and how they relate to the s. The course will use cgs units, as does our textbook classical electrodynamics, 2nd ed. Conversion of formulae and quantities between unit systems nikolai g. All the units which are defined expressed in terms of fundamental units are called derived units. To convert from one system to the other, cgs unit factor mks unit. Introduction within the metric system, there are actually two separate selfconsistent systems. As initialisms the difference between mks and cgs is that mks is meterkilogramsecond system of units while cgs is. Conversion of formulae and quantities between unit systems. There are several other units of pressure such as pounds per square inch and bar, unit of atmospheric pressure is atm, centimetres of water, millimetres of mercury or. The centimetregramsecond system cgs is a system of physical units. English units may be used as secondary units in parentheses. A second, at one time defined as a fraction 186400 of a day, is now defined as 9 192 631 770 times the period of a hyperfine line emitted in the spectrum of the 3 cs caesium atom.
Mks whereas in cgs they are the centimeter, gram, and second. For the love of physics walter lewin may 16, 2011 duration. An exception would be the use of english units as identifiers in trade, such inch disk drive. Mks is a system of units for mechanics based on the three fundamental quanti ties of length, mass, and time using the mete r, kilogram, and second, respectivel y.
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