For those who view coffee not just as a daily ritual but as a craft, understanding the science behind brewing is essential. One of the most critical yet often overlooked factors in creating the perfect cup of coffee is grind size. Grind size directly influences the extraction process, which, in turn, defines the flavour profile of your coffee. The interplay between particle size, surface area, extraction time, and solubility is at the heart of this process. In this deep dive, we'll explore the scientific mechanics behind how grind size affects your brew and how you can fine-tune it for optimal results.