The candle will burn for a time but will eventually go out and you will see that the water rises up into the jar. You will find out that the water will rise about one-fifth of the way up the jar. Water rises in the container due to an imbalance in pressure. As the gas inside the container heats and expands causing bubbling around the base. The oxygen inside diminishes, the flame gets cooler, and so does the air resulting in a pressure drop.
Water starts to move into the container.
When the candle is extinguished, the temperature in the flask drops, causing a further reduction in pressure and a further rise in the water level. Place two sheets of notebook paper on the ruler and press against the table until the paper is flat as possible. Now hit the overhanging portion of the ruler with your hand and try to make the paper fly into the air. Repeat this procedure using two sheets of unfolded newspaper and record your results. The ruler should snap when placed under the newspaper, but not when placed under the notebook paper.