How does the fragrance of the scented candles spread?

The aroma release of scented candles is a process that combines physics and chemistry, with the core being the release and diffusion of aromatic substances driven by heat.

1. Combustion and Melting: The Starting Point of Aroma Release

After lighting the wick, the heat from the flame gradually melts the wax around the wick.

The liquid wax is drawn up the wick through capillary action and further vaporizes and burns in the flame.

During this process, the aromatic essential oils or fragrances mixed in the wax are heated and transformed from liquid or solid to gaseous aromatic molecules.

2. Diffusion and Volatilization: Filling the Space with Aroma

The gaseous aromatic molecules rise with the hot air current produced by the combustion and diffuse into the surrounding air.

At the same time, the wax pool formed by the melting of the candle surface continuously volatilizes the fragrances, allowing for a slow release of aroma even when the flame is small.

High-quality natural waxes (such as soy wax and coconut wax) can carry and release fragrances more evenly, ensuring a more stable diffusion of the aroma.

3. Key Factors Affecting Aroma Release

Type of Wax: Natural waxes (such as soy wax) have a lower melting point, burn more completely, and release aromas more evenly; paraffin wax has a strong burst of aroma but may produce more black smoke during combustion.

Wick Thickness: A wick that is too thick can cause rapid burning, overheating of the wax pool, and an overly intense release of aroma; a wick that is too thin can result in a small wax pool and insufficient aroma release.

Environmental Conditions: Well-ventilated spaces accelerate the diffusion of the aroma but may also lead to a decrease in aroma concentration; in a closed space, the aroma accumulates more quickly, but safety should be a concern.