SCIENCE | FACTS | BEYOND | HISTORY | on Instagram: "• Why don’t petrol tanks explode, even though petrol is highly flammable? • Petrol itself does not explode — petrol vapor does. • Explosion requires the right fuel-to-air ratio. • Inside a full tank, there is very little oxygen. • Without oxygen, combustion cannot occur. • Liquid petrol does not burn easily on its own. • The fuel vapors are trapped in a controlled environment. • Modern tanks are sealed to limit air entry. • Fuel systems are des