The SI unit of temperature is the kelvin (K).
Key Points
- The kelvin (K) is the base unit of temperature in the International System of Units (SI).
- It starts from absolute zero (0 K), the lowest possible temperature where particle motion stops.
- Unlike Celsius (°C) or Fahrenheit (°F), the kelvin scale has no negative values.
- Relationship:
- 0 °C = 273.15 K
- K = °C + 273.15
In daily life, we often use Celsius (°C) or Fahrenheit (°F), but in science and SI system, kelvin (K) is the standard.