Firefighting: Understanding Fire Growth, Spread, and Ventilation Effects in Firefighting ππ₯ <h2 id="the-science-of-fire-how-it-starts-and-grows-ποΈπ₯">The Science of Fire: How It Starts and Grows ποΈπ₯ Fire needs three things to exist: heat, fuel, and oxygen. This is called the Fire Triangle. Remove one, and the fire diesβkind of like a sausage sizzle without sausages, a BBQ without gas, or cricket without tea breaks. But when all three are present? Fire spreads fast! π₯β¦