Question

The base SI unit for temperature is:

1) Fahrenheit
2) Kelvin
3) Celsius
4) atmospheres
5) none of the above

Answer 1

The base SI unit for temperature is kelvin (K), which is an absolute temperature scale and starts at absolute zero (-273.15°C).

Step-by-step explanation:

The base SI unit for temperature is the kelvin (K). Kelvin is an absolute temperature scale where 0 K is absolute zero, the point at which all thermal motion ceases. The size of one kelvin is the same as one degree Celsius; however, their numerical values differ as the kelvin scale starts at absolute zero, which is -273.15°C. This means that the freezing point of water is 273.15 K and the boiling point is 373.15 K. Although Celsius is widely used, especially in non-scientific contexts, the official SI unit is the kelvin. Fahrenheit is primarily used in few countries like the U.S. for weather, medicine, and cooking.