Distilled water is easy to make at home once you know how to do it.

Distilled water might not be something you think about every day, but in the middle of an emergency, it can quickly become one of the most important supplies in your home. Whether you're using a CPAP ...

Listen to the full series on BBC Sounds. Fractional distillation works because the different liquids have different boiling points. When the mixture is heated: vapours rise through a column which is ...