ELi5: Why do some candles burn longer than others, even when they’re the same size?

Question

Two candles.
Same size.
Different brands.
What’s in them that make some burn longer than others?

In: Chemistry

Answer 1

Could be different densities or types of wax that affect the burn speed. Size of the wick, and therefore size of the flame, is also going to play a role in how quickly the candle burns. I’m guessing that maybe room temperature could affect the longevity of the candle to; the warmer it is, the less heat energy is needed to melt the next bit of wax, so it might burn more intensely and faster. Theoretically, in a closed room, the candle would burn slower as time went on, as it consumed more and more oxygen.