Mr Cool the managerHi. I'm Mr Cool, the manager. We make a lot of chemicals at my factory, and one of them needs to be stored at a very low temperature. It needs to be kept at -30°C or it will become unstable and may even explode!

Cooling equipment

To keep it cool we can use a very cold liquid inside cooling pipes - but what liquid could we use? Could we use water?

Water usually freezes solid at 0°C. Can you stop water from freezing below zero?

Here is one way to stop water freezing at zero