Quantity	SI Base Unit	English Equivalent	Definition
length	meter (m)	1 m = 39.36 in	distance travelled by light in a vacuum in 1/299792458 of a second
mass	kilogram (kg)	1 kg = 2.2 lbs	mass of a platinum/iridium cylinder kept in Paris
time	second (s)		time required for 9,192,631,770 cycles of the 3.26 cm microwave line of cesium-133.
temperature	kelvin (K)	°F = 1.8(oC)+32 K = °C + 273.15	273.16 degree K is assigned to the triple point of water (where vapor, liquid, and ice are at equilibrium)
electric current	ampere (A)		amount of current flowing through each of two long parallel wires separated by 1 m that results in a force of 0.2 micronewtons per meter along the wires
luminous intensity	candela (cd)		luminous intensity of 1/600000 m2 of a radiating cavity at the melting point of platinum (2042 K)
amount of substance	mole (mol)		amount of substance that contains the same number of particles as the number of atoms in a sample of pure carbon-12 weighing exactly 12 g