What is the SI unit for temperature?

What is the SI unit for temperature?

• A. Rankine (°R)
• B. Celsius (°C)
• C. Fahrenheit (°F)
• D. Kelvin (K)

Answer: (D)

Kelvin is the SI unit for measuring thermodynamic temperature. The Kelvin scale is defined from absolute zero, the lowest possible temperature, with 0 K corresponding to -273.15 °C, and the size of one kelvin matching one degree Celsius. This absolute, unit-based scale is what makes Kelvin the standard in science and engineering, while other scales like Celsius or Fahrenheit are relative scales more convenient for everyday use. Rankine is an absolute scale based on Fahrenheit increments but is not part of the SI system, and Fahrenheit is not an SI unit.

Kelvin is the SI unit for measuring thermodynamic temperature. The Kelvin scale is defined from absolute zero, the lowest possible temperature, with 0 K corresponding to -273.15 °C, and the size of one kelvin matching one degree Celsius. This absolute, unit-based scale is what makes Kelvin the standard in science and engineering, while other scales like Celsius or Fahrenheit are relative scales more convenient for everyday use. Rankine is an absolute scale based on Fahrenheit increments but is not part of the SI system, and Fahrenheit is not an SI unit.