Final answer:
The basic unit of thermal dynamic temperature in the SI system is the kelvin (K). The Kelvin temperature scale is an absolute temperature scale, with 0 K corresponding to the lowest temperature that can theoretically be achieved.
Step-by-step explanation:
The basic unit of thermal dynamic temperature in the SI system is the kelvin (K).
The Kelvin temperature scale is an absolute temperature scale, with 0 K corresponding to the lowest temperature that can theoretically be achieved.
The conversion between the Kelvin and Celsius scales is as follows: K = °C + 273.15.