Sulphur (also spelled sulfur) is a bright yellow chemical element that's been known to humans for thousands of years. If you've ever smelled rotten eggs, you've experienced the distinctive sharp odor that sulphur compounds create. The element appears naturally in volcanic regions, where ancient peoples collected it as yellow crystals near hot springs and volcanic vents.

Sulphur plays a crucial role in modern life. It's essential for making sulphuric acid, one of the most widely produced chemicals in the world, used in everything from car batteries to fertilizers that help grow food. Your body actually needs small amounts of sulphur to build proteins and keep your cells healthy.

In medieval times, people called sulphur “brimstone,” and it appears in the Bible as a symbol of divine punishment. Alchemists experimented with it extensively, and it became one of their fundamental substances. Today, sulphur helps create matches, gunpowder, rubber for tires, and medicines. The element is number 16 on the periodic table, with the chemical symbol S.

When sulphur burns, it produces a blue flame and that characteristic acrid smell. Scientists measure sulphur content in fuels because when it burns in engines, it can create pollution. That's why modern regulations limit sulphur in gasoline and diesel.