# Units and Conversions

The International System of Units (SI) contains seven BASE UNITS that each represent a different kind of physical quantity.

* Length* (Online Converter)

- SI unit: meter (m)
- The meter defined as "the length of the path traveled by light in vacuum during a time interval of 1/299,792,458 of a second."

** Volume** (Online Converter)

- SI unit: cubic meter (\(m^3\))
- The cubic meter is defined as the volume of a cube with edges one meter in length. A
*liter*is exactly 1/1000^{th}of a cubic meter.

* Mass *(Online Converter)

- SI unit: kilogram (kg)
- The kilogram is defined as being equal to the mass of the
*International Prototype of the Kilogram*(manufactured in 1799).

* Pressure *(Online Converter)

- SI unit: pascal (Pa)
- The pascal is a derived from other units

\[1\, Pa = 1 \dfrac{kg}{m \cdot s^2}\]

* Temperature* (Online Converter)

- SI unit: kelvin (K)
- The kelvin is defined as the fraction
^{1}⁄_{273.16}of the thermodynamic temperature of the triple point of water (exactly 0.01 °C).

* Energy *(Online Converter)

- SI unit: joule (J)
- The joule is derived from other units

\[1 \, J = 1 \, kg \dfrac{m^2}{s^2}\]