Which candle will stay lit for the longest time?

This is where soy reigns supreme. Paraffin wax tends to be cheaper, and burns at a much faster rate than soy wax. In comparing two candles of the same size, a paraffin candle will usually have a lifespan of 35 to 40 hours whereas a soy candle can burn for 50 to nearly 80 hours.

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One may also ask what would happen if a lighted candle is uncovered?

What happens if you cover a lit candle in a water basin with a glass? The glass becomes foggy on the inside and the flame fades and eventually goes out. The burning candle produces carbon dioxide and water in the form of water vapor. The glass becomes foggy due to this water. What properties should a wick have? Important characteristics of the wick include diameter, stiffness, fire-resistance, and tethering.

Also, where does candle wax go when it burns?

When candles burn, most of their matter goes into the air. The light and heat from a candle comes from the wax burning. When you light the wick, the flame causes some of the wax to melt, flow up the wick and evaporate, and then the wax vapor burns. In respect to this, why is my candle flame dancing? Any bursts of air that cause your candle flame to dance around also cause your wick to use fuel at an inconsistent pace. The wick is drawing oil from the candle wax as fuel, and a buildup is created within the wick. Bursts of air cause the flame to burn less oil than the wick is taking in.

Keeping this in consideration, how do you stop a candle flame from flickering?

Generally candle flames flicker as there is too little, or too much, air reaching the flame; moving air disturbs the candles flame causing smoke. To prevent this, always burn your candles in well ventilated rooms, away from drafts or strong air currents.