1. The unlit candle will not smell the energy of the candle, but the burning smell is caused by the carbonization of the cotton core of the candle. You will see white smoke above the wick. In fact, these white cigarettes are small particles of paraffin solid. After the candle burns and blows out, the solid turns into liquid, and the blue flame smells like liquid wax.

2. The main component of candle is paraffin, and the product of complete combustion is carbon dioxide. Water is a colorless and odorless substance. Incomplete combustion will produce carbon monoxide, which is also a colorless and odorless substance.