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Uploaded on May 21, 2010
Make two small holes in an egg, using a small screwdriver, and blow out the yolk. Let the egg shell dry out for a few days. Fill the egg with hydrogen gas. Attaching a pipette to the end of the rubber tubing from the hydrogen cylinder allows you to direct the gas into one of the small holes. It is safest to do this part in a fume cupboard, but the actual explosion can be done outside the fume cupboard.
Covering both holes with thumb and forefinger, place the egg on a clay pipe triange and tripod, so that one hole is pointing up and the other down. Light the hydrogen gas at the top hole and stand back. The flame will burn for a few seconds, drawing air in through the lower hole. When the mixture of air and hydrogen is just right the egg will explode.
I tried filming this in slow motion using a 'Phantom video camera' borrowed from a parent. The film was made at Dr Challoner's Grammar School in 2007.