Saturday, February 19, 2011
Big Bubbles
Sunday, January 30, 2011
Hot Air Ballons
Monday, January 17, 2011
Carbide Flames
We saw a methane experiment on TV, and we decided to check if it would work with acetylene.
First we needed to make some stuff. We needed a gas generator. We cut the centre out of the lid of a hot chocolate bottle, and glued a plastic funnel on top. Next we took some pipe the builders had left in our garden, and fitted it onto the funnel. The plastic bottle may melt, but glass bottles are too dangerous to use in case they explode.
Next we got the bubble bucket ready. We put a little water into a plastic bucket and added quite a lot of dish washing liquid. Then we put the free end of the builders pipe into the soapy water, and put a brick on top to keep the pipe under water.
The last thing we had to make was a long distance fire lighter. We tied a candle onto the end of a long stick, and lit the candle.
We put some carbide into the gas generator, added some water, and screwed the lid on quickly. Dad said this was the dangerous bit, so he did this part. the carbide in the bottle started to fizz and the gas generator got quite warm, so we put it into another bucket of water to keep cool.
Very soon, the gas started bubbling out of the end of tube under water, and made lots of bubbles. I took the burning candle and stuck it into the bubbles and woosh, we had a great big flame followed by lots of black smoke.
We took turns lighting the bubbles until it stopped bubbling. The gas coming out of the generator was very smelly.