Which Part of the Flame is the Hottest?

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Author: Sofia PC

Grade Level: 7th-9th; Type: Chemistry


Find out which part of a flame burns wood (in this case, a toothpick) the fastest and also if this is true for all types of flames such as candle-flame, burners, and lighters.

Research Questions:

  • Does the color of the flame indicate temperature?
  • Does the speed of the burn indicate temperature?

A candle is one of the earliest forms of lighting. It is commonly made with a wax substance with a cotton string in the center called the “wick”. The wick is lit with a source of fire and the candle lasts until all the wax melts.

Matches are made from a tiny piece of thin wood. One end is coating with a substance that ignites due to friction on a given surface. This substance is usually a form of phosphorus.

Lighters provide flame in the form of liquid gas. The liquid gas is housed inside a casing and as the lighter is pressed, the liquid is drawn up and manifested in the form of fire. When the ignition is released, the flame is put out.

A bunsen burner is commonly used in a laboratory for heating, sterilization and combustion. The source of the flame is continuous gas. Depending on how open the airhole of the burner is, it produces a flame of different color and height.


  • Box of toothpicks
  • Candle
  • Bunsen burner
  • Matches
  • Lighters
  • Bowl of water

Experimental Procedure:

  1. Light a candle.
  2. Take one toothpick and stick one end in the center of the flame until it starts to burn. How fast did that happen? Quickly put the burnt toothpick in the water.
  3. Now, stick the end of another toothpick close to the base of the flame. How fast did that burn? Quickly put the burnt toothpick in the water.
  4. Finally, stick the end of a new toothpick at the tip of the flame at the top. How fast did that burn?
  5. Repeat steps 2-4 for the flames of the bunsen burner, matches, and lighter. Do you spot any differences in burning speed?
  6. Record your results.

Suggested Chart





Candle Flame




Bunsen Burner













Terms/Concepts: Flame/fire; Combustion/ burning; Different types of flames


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