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Best Answer: Yes citronella candles work, but their effectiveness decreases with the age. Oil of Citronella is a volatile, liquid oil derived from dried cultivated grasses. It works by repelling animals and insects without harming or killing them. It has a distinctive odour, which repels certain animals..
Problem 1: Not all the oxygen is consumed An easy way to show that candles only consume a fractionof the oxygen inside the jar is to run the experiment with twocandles at the same time, one short and one tall. You will ï¬nd3. that the taller candle goes out before the shorter one.