What is the zero point for Celsius?

The zero point for Celsius is significant because it represents the temperature at which water freezes under standard atmospheric pressure. However, when considering the absolute zero point, the Kelvin scale introduces a fundamental temperature limit where molecular motion ceases.

In the Celsius scale, 0 degrees is the freezing point of water, and -273.15 degrees Celsius corresponds to absolute zero, which is the lowest possible temperature. This temperature is significant because it is the theoretical point at which particles have minimal thermal energy.

The concept of absolute zero provides a critical reference for understanding thermal energy and temperature in physics. The Kelvin scale, which starts at absolute zero, shows that -273.15 degrees Celsius also marks the point where there is no thermal energy left in a system. Hence, identifying -273.15 as absolute zero is essential to grasping the complete concept of temperature and thermal dynamics.