← Back to the archive★ Support my pages
DD-300ScienceFiled Last updated

A Real Hot Head

Short answer: A safety match head typically contains potassium chlorate as an oxidizer, sulfur and other fuels, ground glass for friction and a binder. The striking strip on the box holds red phosphorus and powdered glass.

When the match is struck, friction converts a tiny amount of red phosphorus into white phosphorus, which ignites in air; that heat starts the potassium chlorate decomposing to release oxygen, which burns the sulfur and other fuels in the head and then lights the wood or paper stick. Strike-anywhere matches carry phosphorus sesquisulfide in the head itself. The footage shows close-ups of a match head igniting.

VideoWrite-up1 sources

In collections:Everyday Physics

More like this★ Support my pagesCite this file

What should you know about A Real Hot Head?

Quick facts. Each one stands alone and has a stable ID you can cite.

  1. Safety matches need the phosphorus on the striker.

    DD-300-F01 · Write-up · Exhibit B (The striker)

  2. Potassium chlorate supplies oxygen to the flame.

    DD-300-F02 · Write-up · Exhibit D (Oxygen release)

Video transcript: A Real Hot Head: A Safety Match Needs the Box to Light

DID YOU KNOW? Match head combustion involves a chemical reaction that ignites when the match is struck. The head of a match typically contains a mix of chemicals like potassium chlorate, sulfur, and glass powder. When struck against a rough surface friction generates heat causing the potassium chlorate to decompose. This decomposition releases oxygen which reacts with the sulfur and other materials to produce a flame, allowing the match to burn until it's extinguished. NOW YOU KNOW!

Burned-in captions, read frame by frame (see transcript.md) · 21.8s Reel ·

Video coming soonA Real Hot Head · Instagram Reel
A Real Hot Head: A Safety Match Needs the Box to Light Instagram Reel · · 21.8s

The write-up

A safety match needs the box to light. Friction turns a bit of red phosphorus on the striker into a spark.

  1. Exhibit A

    The head

    A safety match head contains potassium chlorate, sulfur and ground glass.

  2. Exhibit B

    The striker

    The striking strip holds red phosphorus and powdered glass.

  3. Exhibit C

    The spark

    Friction turns a bit of red phosphorus into white phosphorus, which ignites.

  4. Exhibit D

    Oxygen release

    Potassium chlorate releases oxygen that burns the fuels in the head.

  5. Exhibit E

    Strike anywhere

    Strike-anywhere matches have phosphorus sesquisulfide in the head.

Questions people ask about A Real Hot Head

What oxidizer is in a match head?

It releases oxygen.

Source: Write-up · Exhibit A (The head) · Wikipedia: Match

What's on a safety match's striker?

That's why safety matches need the box.

Source: Write-up · Exhibit B (The striker) · Wikipedia: Match

What starts the ignition?

Friction does the conversion.

Source: Write-up · Exhibit C (The spark) · Wikipedia: Match

What does potassium chlorate release?

It feeds the flame.

Source: Write-up · Exhibit D (Oxygen release) · Wikipedia: Match

What's in strike-anywhere match heads?

They light on rough surfaces.

Source: Write-up · Exhibit E (Strike anywhere) · Wikipedia: Match

Test Your Knowledge

All quizzes →

5 questions, all from this case file. Answers are revealed instantly.

  1. What oxidizer is in a match head?

    1. Potassium chlorate
    2. Table salt
    3. Baking soda
    4. Sugar
    Show the answer

    Answer: A. Potassium chlorate It releases oxygen. Source: Write-up · Exhibit A (The head) · Wikipedia: Match

  2. What's on a safety match's striker?

    1. Red phosphorus and glass
    2. Sulfur only
    3. Sandpaper only
    4. Magnesium
    Show the answer

    Answer: A. Red phosphorus and glass That's why safety matches need the box. Source: Write-up · Exhibit B (The striker) · Wikipedia: Match

  3. What starts the ignition?

    1. Red phosphorus turning to white phosphorus
    2. Sunlight
    3. Static
    4. Water
    Show the answer

    Answer: A. Red phosphorus turning to white phosphorus Friction does the conversion. Source: Write-up · Exhibit C (The spark) · Wikipedia: Match

  4. What does potassium chlorate release?

    1. Oxygen
    2. Hydrogen
    3. Nitrogen
    4. Carbon
    Show the answer

    Answer: A. Oxygen It feeds the flame. Source: Write-up · Exhibit D (Oxygen release) · Wikipedia: Match

  5. What's in strike-anywhere match heads?

    1. Phosphorus sesquisulfide
    2. Uranium
    3. Iron
    4. Wax only
    Show the answer

    Answer: A. Phosphorus sesquisulfide They light on rough surfaces. Source: Write-up · Exhibit E (Strike anywhere) · Wikipedia: Match

Cite this case file

Easterling, Marcus. "A Real Hot Head." The Detail Department (DetailEnjoyer), case file DD-300, last updated Aug 15, 2024. https://detailenjoyer.com/case/a-real-hot-head/

Permalink: https://detailenjoyer.com/case/a-real-hot-head/ · Last updated

Markdown version

Cite a single fact by its ID, for example DD-300-F01 → https://detailenjoyer.com/case/a-real-hot-head/#DD-300-F01

Collection · Everyday Physics Case file 21 of 34

Next in Collection · DD-301Video Trickery →