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The materials required for this science fair project:

-    1 tank of hydrogen gas
-    1 flow control valve to control the rate of flow of hydrogen gas from the tank
-    Tubing for the gas outlet, to be connected to the flow control valve
-    1 large basin
-    1 bottle of liquid soap
-    Water
-    1 lighter
-    1 ruler
-    Various filters to control bubble sizes


1.    For this experiment, the independent variable is the size of the bubbles created in the soap solution. The dependent variable is the intensity of flames released during the combustion of the soap bubbles, and this will be determined through observation and comparison. The constants (control variables) are the temperature of the environment (which will remain at room temperature), the size of the basin, the amount of water, the amount of soap and the diameter of the outlet tube.

2.    Attach the lever to the hydrogen tank in order to regulate the amount of gas released from the tank. Attach and secure one end of the tube to the lever.

3.    Fill the basin with liquid soap and some water. Mix the solution and place the loose end of the tube inside the basin. Attach a filter to the end of the tube. Gradually adjust the rate of hydrogen gas released into the soap mixture, and vary the filters used, to create bubbles of different sizes, starting with bubbles with a diameter of 1 millimeter Measure the size of the bubbles with a ruler.

4.    Ignite the bubbles using a lighter, and observe the combustion that results. Record your observations in a table, as shown below.

5.    Repeat steps 3 and 4 to create bubbles of sizes 2mm to 3mm, 4mm to 6mm, 8mm to 15mm and 18mm to 25mm. Record all your observations in a table, as shown below.

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Complexity level:
Project cost ($):
Time required:
2 hours to prepare, 1 hour to conduct the science experiment
Material availability:
Hydrogen gas supplies can be obtained through your school laboratory
Safety concerns:

Suitably qualified persons are required to handle combustible gases and pressurized storage tanks. Safety goggles should be worn at all times. Fire safety precautions should be taken at all times.