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How do matches light?

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Quick answer

A match lights when you strike it, creating friction that heats a tiny bit of red phosphorus on the striking surface. This turns into white phosphorus vapor, which ignites at a low temperature and sets fire to the match head. The burning head then ignites the wooden stick, giving a steady flame.

A match lights when friction against the striking surface ignites a tiny amount of red phosphorus, which then ignites the match head. The burning head provides the sustained heat needed to ignite the wood or paper stick.

Step by step

  1. You press the match head against the striking surface and draw it quickly across.
  2. Friction between the head and the rough surface generates heat.
  3. The heat converts red phosphorus on the striking surface into white phosphorus vapor.
  4. White phosphorus ignites at about 30°C, creating a small flame.
  5. That flame ignites the match head, which contains an oxidizer and fuel.
  6. The burning head heats the wooden stick until it catches fire and burns steadily.

Key things to understand

  1. The match head contains an oxidizer, usually potassium chlorate, and a fuel such as sulfur or rosin.
  2. The striking surface is coated with red phosphorus and powdered glass to create friction.
  3. When the match is struck, friction generates heat that converts a little red phosphorus into white phosphorus vapor.
  4. White phosphorus ignites at about 30°C (86°F), and this flame lights the match head.
  5. The burning head then ignites the wooden stick, which burns steadily to give a lasting flame.

Labelled diagram

  1. Match head

    Contains potassium chlorate oxidizer and sulfur fuel, ready to burn.

  2. Striking surface

    Coated with red phosphorus and powdered glass for friction.

  3. Friction

    Rubbing creates heat, turning red phosphorus into white phosphorus vapor.

  4. Ignition

    White phosphorus ignites, lighting the match head.

  5. Sustained flame

    Burning head ignites the wooden stick, producing a steady flame.

How a match lights

Real-world examples

  • A safety match from a typical matchbox lights only when struck on the box's side, which is coated with red phosphorus.
  • Strike-anywhere matches, often used by campers, can be lit on a rough rock or the sole of a shoe.
  • In a laboratory, a match is sometimes used to light a Bunsen burner, relying on the same friction-ignition principle.
  • During power outages, people use matches to light candles, showing how a small flame can be a reliable source of light.

Common mistake

✗ Myth: Many people think that striking a match creates a spark that directly ignites the match head.

✓ Fact: Actually, friction first converts red phosphorus on the striking surface into white phosphorus vapor, which ignites at a low temperature. That small flame then ignites the match head, which in turn lights the stick.

People also ask

What chemicals are in a match head?
A typical match head contains an oxidizer like potassium chlorate, a fuel such as sulfur or rosin, and a binder like starch or glue. The oxidizer supplies oxygen to keep the flame burning, while the fuel provides the material to burn. Some matches also include dyes for color and fillers to control the burn rate.
Why do matches burn?
Matches burn because of a chemical reaction called combustion, where the fuel in the match head reacts with oxygen from the air. The oxidizer in the head provides extra oxygen, making the reaction fast and hot. This releases heat and light, which we see as a flame, and the heat sustains the reaction until the fuel is used up.
How hot is a match flame?
A typical match flame reaches about 600 to 800 degrees Celsius (1100 to 1500 degrees Fahrenheit). The exact temperature depends on the match's composition and how freely oxygen can reach the flame. This is hot enough to ignite paper, wood, or a candle wick, but not hot enough to melt most metals.
Why do you need the special striking surface to light a match?
The striking surface provides the red phosphorus that turns into flammable white phosphorus when heated by friction. Without it, the match head alone cannot reach its ignition temperature easily. That is why safety matches only light on the prepared surface.
What is the difference between safety matches and strike-anywhere matches?
Safety matches have the phosphorus only on the striking surface, while strike-anywhere matches contain phosphorus sesquisulfide in the head itself. Strike-anywhere matches can be lit on rough surfaces like sandpaper or a brick. Safety matches are safer because they need the specific surface.
Why does a match flame go out when you shake it?
Shaking removes the hot gases and vaporized fuel from the flame zone, and the rapid air movement cools the match below its ignition temperature. Without enough heat to keep vaporizing the fuel, the flame cannot sustain itself and goes out.
Can a match light in the wind?
Wind makes it harder because it blows away the heated gases and vaporized fuel that form the flame. A match can still light if the wind is gentle, but strong gusts cool the match head and prevent the flame from establishing. Cupping your hands helps block the wind.

Part of the guide: Everyday Science: Light, Heat & Matter →