Question

Why does a candle blow off when moving air acts on it even if it is getting more oxygen from the wind ?

Answer 1

Three things are required for any flame: oxygen, fuel, and heat. A fire will not ignite if it lacks any one of these. When it comes to air, oxygen is normally the easiest to get.From oxygen and fuel, fire is a chemical reaction that produces light and heat. In order to keep burning, a lit candle has to draw oxygen from the air. If the amount of air available is restricted, the candle's flame will eventually go out when it consumes all of the oxygen.

Complete answer:
The candle will blow out as it is exposed to moving air, even though it is receiving more oxygen from the wind because the candle requires normal ventilation provided by the heat of the flame. When we blow, the air flows faster than the speed of the flame in front, causing the candle to blow out when it comes into contact with moving air.

Bernoulli's Principle states that as the speed of air increases, the pressure decreases.When we blow against the flame on one side, we create a low-pressure zone (the faster the air moves, the lower the pressure). The comparatively high-pressure air on the other side of the candle will flow over to fill the low-pressure area ("winds will blow from high to low"), essentially moving the flame over, which makes the flame go off.

Note: The wax near the wick will melt when we light the candle. The liquid wax is absorbed by the wick. The heat emitted by the flame causes the liquid wax to vaporise. As wax vapour comes into contact with a flame, it burns, producing new compounds such as carbon dioxide, carbon soot, water vapours, heat, and light.