International System of Units Content Basic informations Basic

International System of Units

Content � Basic informations � Basic units � Derived units � Multiplying and fractional units � Additional units � Adjacent units

Basic informations � The International System of Units is the modern form of the metric system and it is generally a system devised around the convenience of the number ten. It is the world's most widely used and oldest system of measurement, both in everyday commerce and in science. � Adopted by the 11 th General Conference on Weights and Measures in 1960, it is abbreviated SI in all languages.

Basic units NAME SYMBOL QUANTITY metre m length kilogram kg mass second s time ampere A electric current kelvin K thermodynamic temperature candela cd luminous intensity mole mol amount of substance

Derived units NAME SYMBOL QUANTITY Expression in terms of SI base units hertz Hz frequency s-1 radian rad angle dimensionless steradian sr solid angle dimensionless newton N Force, weight m∙kg∙s− 2 pascal Pa pressure, stress m− 1∙kg∙s− 2 joule J energy, work , heat m 2∙kg∙s− 2 watt W power, radiant flux m 2∙kg∙s− 3 coulomb C Electric charge, flux s∙A volt V voltage, potential difference m 2∙kg∙s− 3∙A− 1 farad F electric capacitance m− 2∙kg− 1∙s 4∙A 2

NAME SYMBOL QUANTITY Expression in terms of SI base units ohm Ω electric resistance, impedance, reactance m 2∙kg∙s− 3∙A− 2 siemens S electrical conductance m− 2∙kg− 1∙s 3∙A 2 weber Wb magnetic flux m− 2∙kg− 1∙s 3∙A 2 tesla T magnetic field kg∙s− 2∙A− 1 henry H inductance m 2∙kg∙s− 2∙A− 2 Degree Celsius °C temperature K lumen Im luminous flux cd lux Ix illuminance m− 2∙cd becquerel Bq radioactivity s− 1 gray Gy absorded dose m 2∙s− 2 sievert Sv equivalent dose m 2∙s− 2 katal kat catalytic activity s− 1∙mol

Multiplying and fractional units NAME SYMBOL MULTIPLYING POWER exa E 1 000 000 000 = 1018 peta P 1 000 000 000 = 1015 tera T 1 000 000 = 1012 giga G 1 000 000 = 109 mega M 1 000 = 106 kilo k 1 000 = 103 mili m 0, 001 = 10 -3 mikro µ 0, 000 001 = 10 -6 nano n 0, 000 001 = 10 -9 piko p 0, 000 000 001 = 10 -12 femto f 0, 000 000 001 = 10 -15 atto a 0, 000 000 000 001 = 10 -18

• units - the power of 2 NAME SYMBOL MULTIPLYING POWER hekto h 100 = 102 deka da 10 = 101 deci d 0, 1 = 10 -1 centi c 0, 01 = 10 -2

Additional units GUANTITY SYMBOL NAME OF SI SUPPLEMENTA RY UNIT SYMBOL FOR SI UNIT angle θ radian rad solid angle Ω steradian sr

Adjacent units QUANTITY time duration volume � NAME SYMBOL minute min hour h day d astronomic unit AU ray pc light year ly litre l There are only the best known adjacent units.

SOURCES: � � � http: //en. wikipedia. org/wiki/International_System_of_Units http: //www. converter. cz/jednotky. htm http: //ourworld. compuserve. com/homepages/Gene_Nygaard/intern at. htm http: //www. britannica. com/EBchecked/topic/291305/International. System-of-Units http: //en. wikipedia. org/wiki/SI_supplementary_unit http: //slovnik. seznam. cz/ Created by : Veronika Pokorná �