SI units and abbreviations
Table 4: Fundamental units and physical quantities in the International System of Units (SI)
Physical quantitySymbolFundamental unitUnit abbreviation
Massmkilogramkg
Lengthx, d, lmeterm
Timetseconds
Electric currentIampereA
TemperatureTkelvinK
Luminous intensityIvcandelacd
Amount of a substancenmolemol
Table 5: Derived units and physical quantities in the International System of Units (SI)
Derived quantitySymbolDerived unitUnit Equivalence in
fundamental units
AreaAsquare meterm2
VolumeVcubic meterm3
Speed or velocityvmeter per secondm/s
Accelerationameter per second squaredm/s2
Density or mass densityρkilogram per cubic meterkg/m3
ForceFnewtonNkg m/s2
Energy and workE or WjouleJkg m2 s−2
PowerPwattWkg m2 s−3
PressurePpascalPaN/m2 or kg m−1 s−2
FrequencyfhertzHzs−1
Magnetic fieldBteslaTkg A−1 s−2
Magnetic fluxΦweberWbkg m2 A−1 s−2
Electric chargeqcoulombCA s
Electric potential, potential difference, or voltageVvoltVkg m2 A−1 s−3
Electric fieldEvolt per meter or
newton per coulomb		V/m
N/C		kg m A−1 s−3
kg m s−2 C−1
ResistanceRohmΩkg m2 A−2 s−3
CapacitanceCfaradFA2 s4 kg−1 m−2
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