Why do candles smell once they're blown out

The Science Behind Candle Smells

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Candles release their pleasant fragrances when they are lit due to the process of combustion. When a candle wick is ignited, the heat causes the wax to melt and vaporize, releasing aromatic compounds into the air. This is why we enjoy the delightful scents while the candle is burning.

Once the candle is blown out, a different phenomenon occurs. The remaining wax and soot can still release volatile organic compounds (VOCs) as they cool down. This means that even after the flame is extinguished, there are still residual scents lingering in the air, giving off an aroma that can be detected by our noses.

The Role of Soot and Residual Wax

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When a candle is extinguished, the wick can produce soot. These tiny carbon particles may carry some of the scent from the wax, contributing to the smell you notice after blowing out the candle. The soot itself can have a slightly smoky odor, which mixes with the remaining fragrance of the wax.

Additionally, the wax that remains on the wick can continue to release aroma compounds as it cools. The melting process creates a reservoir of scent that can linger in the air for a short time after the flame is gone. This combination of residual wax and soot is what creates the unique smell we associate with extinguished candles.

Factors Influencing Post-Extinguishing Scents

The type of wax used in the candle plays a significant role in the scent that remains after blowing it out. Paraffin wax, soy wax, and beeswax all have different chemical compositions, which can affect how they release scents during and after burning. For example, soy wax tends to hold onto fragrances better than paraffin, leading to a more pronounced scent once the candle is extinguished.

Temperature and airflow also impact how the scent disperses in the air. In a still room, the aroma might linger longer, while a draft can dissipate the scent more quickly. The size of the candle and the amount of fragrance it contains also contribute to how strong the smell will be after the candle is blown out.