Chemistry · Chapter 10
🔥 Combustion & Fuel
Burning, flames, energy release.
💡 Fire is a Reaction
Combustion is when a fuel reacts rapidly with oxygen, releasing heat and usually light. For combustion you need three things — the fire triangle:
• Fuel (wood, gas, petrol, hydrogen)
• Oxygen (from air)
• Heat (to start the reaction)
Remove any one — the fire goes out. That's how fire extinguishers work (they cut off oxygen).
CH₄ + 2O₂ → CO₂ + 2H₂O + Heat
Complete combustion (plenty of O₂) → blue flame, CO₂ + water.
Incomplete combustion (less O₂) → yellow smoky flame, carbon monoxide (toxic!).
Bunsen burner flames — luminous (incomplete) vs blue (complete combustion)Wikimedia Commons / CC BY-SA 3.0
LPG cylinder — liquefied petroleum gas, India's main cooking fuelWikimedia Commons / CC BY-SA 3.0
🎬
The Fire Triangle
AnimationFire needs all three: fuel + oxygen + heat. Tap a circle below to remove it — flame dies!
🧪
Put Out the Fire
ExperimentRemove any one ingredient — fire dies. That's how fire-fighting works!
Fire status🔥 Burning
All three ingredients are there — fire keeps burning. Remove one to extinguish.