Quantities and Units - Prefix Symbol Multiple of Unit...

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Quantities and Units In science a  Quantity  is expressed as the product of a number and a unit. A number without  units often has no meaning to a scientist. A set of standard (agreed upon) units are essential  not only in science, but also in commerce. The most widely accepted system of measurement  in the sciences is the  International System , otherwise known as S.I. Units. S.I. stands for Le Systéme International. This is also called the  metric system , with which  you may already be familiar. The metric system is easy to learn and use because subdivisions and multiples of base units  employ only factors of 10. Prefices indicate the size of the unit relative to a base unit.
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Unformatted text preview: Prefix Symbol Multiple of Unit mega-M 1,000,000 or 10 6 kilo-k 1,000 or 10 3 deci-d 0.1 or 10-1 centi-c 0.01 or 10-2 milli-m 0.001 or 10-3 micro- 0.000001 or 10-6 nano-n 10-9 pico-p 10-12 The SI system defines seven base quantities, from which all other scientific quantities can be derived. These base quantities are length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity. All other quantities can be derived from these base quantities using the equations of physics and chemistry. Let's look at the base units for some base and derived quantities....
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