How does a burning candle decrease the amount of oxygen in a room?

Question: How does a burning candle decrease the amount of oxygen in a room?
- Keywords:
  candle,
  oxygen
Asked by BOB to Reka on 18 Nov 2016.
- Reka Nagy answered on 18 Nov 2016:
  
  Burning is just another name for a chemical reaction that consumes oxygen! In order for a candle to burn (for the wick to react with oxygen) it needs oxygen – that’s why things don’t burn in space!

Question: How does a burning candle decrease the amount of oxygen in a room?