When it comes to extremely low temperatures, -273 degrees Celsius is better known as absolute zero. This is the point at which all molecular motion ceases, making it the coldest possible temperature in the universe.

Absolute zero is a fundamental concept in physics and thermodynamics, serving as the starting point for the Kelvin temperature scale. In Kelvin, absolute zero is defined as 0K, which is equivalent to -273.15 degrees Celsius. This temperature is crucial in understanding the behavior of gases and the laws of thermodynamics.

At absolute zero, atoms and molecules have minimal energy and are essentially frozen in place. This extreme cold has a number of interesting and counterintuitive effects, such as superconductivity and superfluidity. Superconductors, for example, can conduct electricity without any resistance at temperatures close to absolute zero.

Scientists have been able to achieve temperatures very close to absolute zero in laboratory settings using techniques such as laser cooling and magnetic cooling. These ultra-cold temperatures are essential for studying quantum mechanics and developing new technologies like quantum computers.

To learn more about absolute zero and its significance in the world of physics, you can visit websites such as Encyclopaedia Britannica or NASA's Science website. These resources provide in-depth explanations and insights into the fascinating world of extreme cold temperatures.

In conclusion, -273 degrees Celsius is better known as absolute zero, the coldest possible temperature in the universe where all molecular motion ceases. This temperature plays a crucial role in physics and thermodynamics, serving as the starting point for the Kelvin temperature scale and enabling the study of exotic phenomena like superconductivity. By delving into the world of absolute zero, scientists continue to push the boundaries of our understanding of the universe.

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