Here's why:
* SI base units: The seven fundamental units in the SI system are:
* Length: meter (m)
* Mass: kilogram (kg)
* Time: second (s)
* Electric current: ampere (A)
* Thermodynamic temperature: kelvin (K)
* Amount of substance: mole (mol)
* Luminous intensity: candela (cd)
* Derived units: Time (second) is a base unit in the SI system. Temperature, however, is a derived unit. The SI unit for temperature is the kelvin (K), which is derived from the definition of thermodynamic temperature.
In summary:
* Time (second) is a base SI unit.
* Temperature (kelvin) is a derived SI unit.
While Celsius (°C) is a common metric unit for temperature, it is not a base SI unit. It is a derived unit based on the freezing point of water.
