I saw the Demo Charles Law - Young lady placed a floating burning candle inside an upside down flask over water. If her theory explanation was correct, the candle would return to water level after the flask returned to room temperature, I submit it won't - The lack of O2 in the air won't allow it. As the candle burned, the water & floating candle began to rise. Charles law? I don't think so... I submit the candle burning, gives off energy in the form of  light, which is emmitted out of the flask, in the process of burning and producing light and heat ... uses up O2 at a faster rate than the expansion of heat. If the the gas was expanding faster than O2 depletion rate due to heat, Bubbles would have appeared outside the bottom of the flask, this did not happen. The depletion of O2 was happening, faster than the rate of expansion, due to the heat. The depletion in O2 caused the reduction in pressure inside the flask and the water to rise due to the imbalance in pressure. This rise would continue even after the candle extinguished, until the pressures balance. Time VS Pressure VS Time to Equalibrium curve. Now to make the demo really good to prove Charles Law, simply Cool the Flask after it returned to room temperature to make the water rise even further.....No doubt remains . Charles Law Hey, what do I know.......something to think about  

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by 4Panny at December 21, 2011