Question

Why on putting on glass over a lighted candle candle flame flickers and produce smoke

Answer 1

Answer:

Flame uses oxygen to burn and cannot burn without the supply of oxygen. When you keep a glass over it, oxygen inside it becomes limited and gets used up quickly by the flame, causing it to flicker and produce smoke.

Answer 2

putting glass on lighted candles cuts out the supply of oxygen . Things burn only in the presence of oxygen . As the supply of oxygen is cut down the candle cannot burn long hence candle flame flickers and produce smoke..