What is absolute zero in kelvins?

Absolute zero is defined as the lowest possible temperature, where a system reaches its minimum thermal energy. In the Kelvin scale, this temperature is represented as 0 K. At absolute zero, the motion of atoms theoretically comes to a complete stop, which is a fundamental concept in thermodynamics and physics.

The Kelvin scale is an absolute temperature scale starting from absolute zero, which means it does not have negative values. Therefore, stating that absolute zero is 0 K aligns perfectly with this scientific understanding.

Other choices like 273 K represent the freezing point of water, while -273 K suggests a temperature that is not physically possible on the Kelvin scale, as it does not allow for negative values. Lastly, 100 K would indicate a significantly higher temperature than absolute zero, which is contrary to its definition.