Capitolo Apparati finali


International System of Units




Derived quantity Name Symbol Definition
area square metre m2
volume cubic metre m3
speed, velocity metre per second m/s
acceleration metre per second squared m/s2
frequency hertz Hz 1/s
plane angle radian rad
solid angle steradian sr
force newton N kg ∙ m/s2
pressure pascal Pa N/m2
energy, work, quantity of heat joule J N ∙ m
power watt W J/s
electric charge coulomb C s ∙ A
electric potential difference volt V W/A
capacitance farad F C/V
electric resistance ohm Ω V/A
magnetic flux weber Wb V ∙ s
magnetic flux density tesla T Wb/m2
Name Symbol Factor Name Symbol Factor
exa E 1018 deci d 10−1
peta P 1015 centi c 10−2
tera T 1012 milli m 10−3
giga G 109 micro μ 10−9
mega M 106 nano n 10−9
kilo k 103 pico p 10−12
hecto h 102 femto f 10−15
deka da 101 atto a 10−18
Base quantity Name Symbol
lenght metre m
mass kilogram kg
time second s
electric current ampere A
thermodynamic temperature kelvin K
amount of substance mole mol
luminous intensity candela cd

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