Final answer:
The SI unit for measuring temperature is kelvin (K), an absolute scale with its zero point at the theoretical absolute zero, and is used primarily in the scientific community.
Step-by-step explanation:
The SI unit for measuring temperature is kelvin (K), which is an absolute temperature scale used in the scientific community. Unlike Celsius and Fahrenheit, the kelvin scale starts at absolute zero, which is the theoretical point where all thermal motion ceases. The kelvin and Celsius scales have increments of the same magnitude, with the kelvin scale offset by 273.15 units. For example, water freezes at 273.15 K (0 °C) and boils at 373.15 K (100 °C), while normal human body temperature is approximately 310 K (37 °C).