‘The water molecule and its interactions’ discusses the structural and electrical properties of the water molecule. A water molecule is made up of two hydrogen atoms connected by covalent bonds to one oxygen atom. Water molecules interact with each other through a type of interaction called hydrogen bonding. A tetrahedral arrangement of four water molecules around a central one is the key to understanding water. It helps to explain the structure of water in its various states, its properties, and how it interacts with other kinds of molecules, allowing exploration of the properties and behaviour of the wide range of chemical, physical, and biological systems in which water is involved.