parts per billion
The International System of units (SI units)
The SI (International System of Units), and the Metric System.
"SI" units.
the metric system. or international system of units
SI stands (in French) for Système international d'unités, the International System of Units [of measurement].
The International System of units uses celsius as the measurement of temperature. It is called the SI system of measurement. The International Union of Pure and Applied Chemists use Kelvin as the official measurement of temperature.
Standard units are used for measurmen as there is a system called the SI units and that is considered as the international system of units that is why we use standard units for measurment .
There are several. In Europe, SI units (System International) Imperial. Avoirdupois.
International System of Measurement
International System of Units
The majority of the world uses the International System of Units, also known as the SI system of measurement from its French name Système international d'unités.
The International System of Units (abbreviated SI from the French Le Système International d'Unités) is the modern form of the metric system and is a system created around the convenience of the number ten. It is the most widely used system of measurement in the world, and provides the standard units of measurement. See the link attached to this for more information.