What is the approximate equivalent of absolute zero in Celsius?

Absolute zero is defined as the temperature at which all thermodynamic motion of particles theoretically ceases, and it is considered the lowest possible temperature. In the Celsius scale, absolute zero is precisely -273.15 °C. This value is derived from the Kelvin scale, where absolute zero is defined as 0 Kelvin. The relationship between the Kelvin and Celsius scales can be defined by the equation:

Temperature in Celsius = Temperature in Kelvin - 273.15.

This fundamental understanding is critical in fields such as thermodynamics and physics, where temperature plays a crucial role in the behavior of materials and energy transfer. The other options do not accurately reflect the definition of absolute zero, which is why they do not represent the correct answer.