Fundamental and Derived Quantities and Units

Density

kg/ m^3 or m/v

Speed

m/s or d/t

Acceleration

m/s^2 or v/t

Mesurement

process of comparing an unknown quantity to a standard

Metric System

the more logical and consistent system of measurement compared to the English system of measurement

Watt

unit of power, work done at a constant rate of 1 joule per second

Erg

Cgs unit of energy, defined as work done by one dyne acting through a distance of 1 centimeter.

Derived Quantities

Combination of two or more basic quantities that are not the same in unit.

Electric Current

Ampere

Luminous Intensity

Candela

Measurement of Derived Quantities

Directly depends upon other quantities

Poundal

English unit of force, force required to accelerate a mass of one pound at one foot per second.

Foot

English unit of length, defined as 0.3048 meter in US

Fundamental

Fixed known quantity that serves as a basis for determining an unknown quantity

Temperature

Kelvin

Mass

Kilogram

Mole

Kilogram molecule, number of kilograms of a substance that corresponds to its molecular weight divided by one thousand.

Area

M^2 or LxW

Volume

M^3 or m/p

Length

Meter

International System of Units

Modern version of the metric system

Amount of Substances or Atoms in an object

Mole

Force

Newton

Pressure

Pascal

Time

Second

BTU (British Termal Unit)

Unit of energy, the heat required to raise the temperature of one pound of water one degree Fahrenheit at a stated temperature.

Joule

Unit of energy, work done by one newton acting through the distance of a meter.

Potential Difference

Volt

Dyne

cgs unit of force, force required to accelerate a mass

Radians

fundamental unit of angle, the angle formed by a length or a circular arc being equal to the radius creating the arc