Question

what is absolute zero?
the theoretical highest temperature
the theoretical temperature at which degrees celsius equals zero.
the theoretical lowest temperature

Explanation:

Absolute zero is the theoretical lowest temperature. At this temperature, all molecular motion stops. It is defined as 0 Kelvin (\(0\ \text{K}\)) or \(- 273.15^{\circ}\text{C}\). The first option is incorrect as it refers to the highest temperature. The second option is wrong because when Celsius is \(0^{\circ}\text{C}\), it is \(273.15\ \text{K}\) (not absolute zero).

Answer:

The theoretical lowest temperature