An agreed, precisely measurable amount.
A system of measurement primarily for length, volume, and weight/mass, using the "meter", "liter", and "gram" units combined with the following prefixes for quantity:
milli (0.001) - centi (0.01) - deci (0.1) - meter/liter/gram (1) - deca (10) - hecto (100) - kilo (1000)
Example: The average male weight is 176 centimeters (1.76 meters) and 53 kilograms (53,000 grams).
The system additionally includes Celsius for measuring temperature (noted as °C) and seconds (s) for measuring time. For scientici measurements, the following units are used: meters (m), liters (l), kilograms (kg); celsius and kelvin for temperature (°C, K).
Contains additional units - mole (mol; quantity), candela (cd; brightness), second (s; time).
|--------|--------|----- ... 0°C 100°C water water freezes boils |--------|--------|----- ... 0K 273.15K 373.15K | theoretical point atomic thermal motion stops