Liquid nitrogen

What is Liquid Nitrogen?

Liquid nitrogen is a very cold kind of air that has been turned into a liquid. It looks clear and moves easily, like water. But it is much colder than ice! It stays liquid at a temperature of about −196 °C (−321 °F), which is very, very cold.

How Do We Make It?

We can make liquid nitrogen by taking regular air and cooling it down a lot. This process is called fractional distillation of liquid air. When air gets very cold, it turns into a liquid, and we can separate the different gases inside it.

Why Do People Use It?

Liquid nitrogen is useful because it can keep things very cold. Scientists use it in laboratories, and doctors use it to treat some skin problems. It also helps keep food fresh for a long time. Sometimes, it is used to freeze water in pipes so workers can fix them without turning off the water. It can even help make ice cream very smooth and creamy.

How Do We Keep It Safe?

Because liquid nitrogen is so cold, it can freeze things very quickly. People who work with it wear special gloves to protect their hands. It is usually stored in special containers called vacuum flasks, which help keep it very cold for several hours or even weeks. It is important to handle liquid nitrogen carefully to stay safe.

Liquid nitrogen was first made on 15 April 1883 by two scientists from the Jagiellonian University, Zygmunt Wróblewski and Karol Olszewski. They showed that nitrogen could be a liquid at very cold temperatures.