Early life. Ferdinand Magellan was born about 1480 to a noble family in Portugal. As a boy, he served the queen of Portugal as a page, and studied cartography and navigation tenaciously.
There are seven fundamental units: the metre, kilogram, second, ampere, kelvin, candela, and mole; and two supplementary units: the radian and the steradian. All other units are derived by multiplication or division of these units without the use of numerical factors. SI units in Medicine Expand. International System of Units n. Abbr. SI. A complete, coherent system of units used for scientific work, in which the fundamental quantities are length, time, electric current, temperature, mass, luminous intensity, and amount of substance. Also called International System. SI unit. Any of the units of measure in the International System.
The SI-derived unit of magnetic flux density, equal to the magnitude of the magnetic field vector necessary to produce a force of one newton on a charge of one coulomb moving perpendicular to the direction of the magnetic field vector with a velocity of one meter per second.