What is the absolute zero temperature in Celsius?

• A. 0°C
• B. -100°C
• C. -273°C
• D. -459°F

Answer: (C)

Absolute zero is defined as the point at which all molecular motion stops, and it represents the lowest possible temperature that can theoretically be achieved. In the Celsius scale, absolute zero is measured as -273.15°C. Therefore, for practical purposes, it is often rounded to -273°C. This temperature is significant in scientific fields, particularly in thermodynamics and physics, because it is the foundation for the Kelvin scale, where absolute zero is set at 0 Kelvin.

The other temperature options provided do not represent absolute zero accurately. The 0°C represents the freezing point of water, which is far above absolute zero. The -100°C is also significantly warmer than absolute zero and is simply another reference point in the Celsius scale. The -459°F is a temperature expressed in Fahrenheit, and while it corresponds to absolute zero, it does not answer the specific question asked regarding Celsius.