User:INTELIGENTANNY/sandbox

SI UNITS (International system of units )

•The international system of units or the SI units ore the modern form of matric system. •It is the most widely used system of units used world wide. •This system is the derivative of all other systems (MKS,CGS etc ) • There are so many difficulties shown in world wide to major things I.e, there was different matrix units in different countries of world.Hence the new peoples face difficulties in manuring things. •Then after in 1999 all physics expert decided to make one and only system of matrices which is to be used all over the world. •Then in 1999 in Singapore the scientists proposed the INTERNATIONAL SYSTEM OF UNITS (SI UNITS ) •This international system of units contains SEVEN fundal units.

SEVEN FUNDAMENTAL UNITS

•Unit of length- Meter (m) •Unit of mass - Kilogram (Kg) •Unit of time - Second (s) •Unit of electric current - Ampere (A) • Unit of thermodynamic/Temperature - Kelvin (K) •Unit of amount of substance - Mole (mol.) •Unit of luminous intensity - Candela (CD)


 * But now a days the International systems of units currently accepted other units than SI units.
 * These units are non SI unit i.e which are derivative units but still we use that units in our daily works.
 * There are mainly nine derivative units which currently accepted by international system of units.

OTHER UNITS OUTSIDE THE SI THAT ARE CURRENTLY ACCEPTED FOR USE WITH THE SI

•Nautical mile •Knot •Acre (a) •Hectar (ha ) •bar (bar) •Angstrom(A° ) •Barn (b) •curie (Ci) •Roentgen (R) Values of otherctan SI units......

1Nautical mile =1852 m 1knot=(1852/3600)m/s 1acre=1 dam∧2=10∧2 m∧2 1hectar=10^4 m^2 1bar=0.1Mpa=100kpa=1000hpa=10^5pa 1angstrom = 10^-10m 1barn=100 fm^2=10^-28m^2 1curie=3.7×10^10 Bq 1roentgen=2.58×10^-4 C/kg


 * 1) Thereare also some universal constants used in SI systems of units like ELECTRIC CONSTANT(8.854187817....×10^-12), NEWTONIAN CONSTANT OF GRVITATION(6.6742×10^-11),MAGNETIC CONSTANTS,PLANCKS CONSTANTS,YOUNGS MODULOS, SPEED OF LIGHT IN VACUM etc.