Metre
The metre (m) is the SI base unit for measuring length. The metre, as of 2002, is defined as the length traveled by light in a vacuum in 1·299,792,458-1 of a second [1].
Square Metre
The square metre (m2) is the SI derived unit for measuring area. The square metre is already expressed in SI base units [2].
Since the square metre is exponential, the quantity grows exponentially by the corresponding power of 10 when using SI prefixes. For example, 1 kilometre (km) is 103 times the legnth of 1 metre (m), but 1 square kilometre (km2) is (103)2 times the area of 1 square metre [2].
Cubic Metre
The cubic metre (m3) is the SI derived unit used for measuring volume. The cubic metre is already expressed in SI base units [3].
A cubic metre can also be converted to litres, 1 cubic metre is equal to 1000 litres. This also means that 1 cubic metre of water at the temperature of maximum density (3.98 °C) and standard atmospheric pressure (101.325 kPa) has a mass of 1000 kg [3].
Since the cubic metre is an exponential unit, the quantity grows exponentially by the corresponding power of 10 when using prefixes. For example, 1cubic kilometre (km3) is (103)3 times the volume of 1 cubic metre [2].
Metre per Second
The metre per second (m/s) is a SI derived unit used for measuring speed (scalar quantity) and velocity (vector quantity). The metre per second is already expressed in SI base units and is equal to the speed of a body covering a distance of one metre in a time of one second [4].
Metre per Second Squared
The metre per second squared (m/s2) is the SI derived unit used for measuring acceleration. The metre per second squared is already expressed in SI based units and is interpreted physically as the change in velocity or speed per time interval and is treated as a vector quantity [5].
The most common example of a metre per second squared, or acceleration, measurement is the acceleration due to the gravitational force which is equal to 9.8 m/s2 [5].