Here's why:

* Liquid nitrogen's temperature: Liquid nitrogen boils at -195.79 °C (-320.42 °F).

* Absolute zero: The coldest possible temperature is absolute zero, which is -273.15 °C (-459.67 °F) or 0 Kelvin. This is the point at which all molecular motion ceases.

* Reaching absolute zero: It is impossible to reach absolute zero in practice. However, scientists can create extremely low temperatures in labs.

Therefore, while liquid nitrogen is very cold, it is far from the coldest possible temperature. There are other substances and experimental techniques that can achieve much lower temperatures.