135 below is correct when he said that balloon had some oxygen in it also. I have been to oxygen acetylene safety classes put on by Smith. In that safety demo. the instructor will fill one baloon with pure oxygen and tie the end off. He would then fill another balloon with pure acetylene and tie the end off. Next he would light the torch and adjust to a netural flame. Next step is to snuff out the flame, then he would fill the third balloon with a 50-50 mixture of oxygen and acetylene. That balloon was tied off and put to one side, way off to one side. These balloons may have been 6 inches in diameter when inflated. He would then ask the class what would happen when he put a flame to each balloon. The pure oxygen balloon was first and it would go pop, the same as if someone had blown it up by blowing into it. The acetylene balloon would go boom. The 50-50 balloon he would ask that all the windows in the room be opened, (The room was on an outside wall) and everyone cover their ears. He would then place the balloon on his metal table, about four feet square. He would get under the table and wave his lit torch at the balloon until he hit it, that would result in a KA-BOOM.
He told us a story about being on the iron range putting on the same demo in a big auditorum for the mine workers. When he was filling the 50-50 balloon one of the people in authority did not think the balloon was big enough to be heard because the auditorium was so huge. He kept telling the safety instructor to make the balloon larger until the instructor refused to go any bigger. All the miners wore hard hats and wore ear protection, with the windows open the balloon was set off and most of the floursent lights in the overhead came tinkling down.
I was told the oxygen acetylene safety demo put on by Smith is now on video. Don't know if someone got hurt or if most class rooms don't have windows. It was 35 years ago I saw the demo and people today are more safety minded.
A friend from works neighbor filled a 30 gallon garbage bag with a 50-50 mixture. He set it off with a bottle rocket, that left a big crater in the ground.
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