Final answer:
The base unit of temperature is the kelvin (K). When divided by 1000, it becomes millikelvin (mK), and when multiplied by 1000, it becomes kilokelvin (kK).
Step-by-step explanation:
The base unit of temperature is the kelvin (K). The kelvin is part of the SI (International System of Units) and is used as the fundamental unit of temperature. It is represented by the symbol K and is defined as 1/273.15 of the triple point of water, which is the temperature at which water exists in its three states of solid, liquid, and gas simultaneously. When the base unit of temperature, kelvin, is divided by 1000, it becomes millikelvin (mK). The millikelvin is 1/1000 of a kelvin and is commonly used in scientific and technological applications that require extremely low temperatures. When the base unit of temperature, kelvin, is multiplied by 1000, it becomes kilokelvin (kK). The kilokelvin is 1000 kelvin and is used in certain areas of physics, such as studies of extremely high temperatures, like those found in astrophysics and particle physics.