If you’ve been in the market for a new hair dryer, you’ve likely seen advertising for ionic ones. Some claim to produce negative ions in the millions – with or without the help of added minerals like tourmaline.

The broader claim is usually that these ions break water molecules into micro-droplets, resulting in faster drying and reducing frizz to give you super smooth, shiny-looking hair.

Are ionic hairdryers actually capable of doing what they claim? To understand this, we need to briefly delve into some fundamentals.

Wait, what is an ion?

All matter is composed of invisible building blocks called atoms. But they’re not the smallest things we know of. Atoms contain subatomic particles – protons, neutrons and electrons.

Every atom has a nucleus, a very dense centre made up of protons and neutrons. The number of protons determines what chemical element the atom is. Hydrogen has one proton, carbon has six, oxygen has eight, and so on. Molecules are groups of two or more atoms that form a chemical element; an oxygen molecule consists of two oxygen atoms, for example.

How does all this relate to ions? This is where electric........

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