What is Absolute Zero?

Absolute zero is the lowest possible temperature, defined as 0 Kelvin (K) or -273.15 degrees Celsius (°C). At this temperature, all matter would theoretically have zero entropy, meaning that it would be in its most ordered state possible.

In other words, at absolute zero, the particles that make up a substance (such as atoms or molecules) would be at their lowest possible energy state, and they would be perfectly still and motionless. This is because the thermal energy that causes the particles to move around and vibrate would be completely eliminated.

It's important to note that absolute zero is a theoretical limit, and it is not possible to achieve in practice. The laws of quantum mechanics dictate that it is impossible to cool a substance to absolute zero, as there will always be a residual motion of the particles known as zero-point energy. However, scientists have been able to get very close to absolute zero using advanced techniques such as laser cooling and evaporative cooling.