From data when I use 1 pieces of candle total the water level in glass equal 2.17 cm., 2 pieces of candle total the water level in glass equal 3.90 cm. and 3 pieces of candle total the water level in glass equal 4.73 cm. so I find that in experiment when I use 3 pieces of candle ,it make the water level is the highest.
The amount of oxygen and carbon-dioxide in the air, air pressure and amount of candles as a result to the water level in glass.