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What are two common examples of diffusion?

Diffusion is the movement of molecules from an area of high concentration to an area of low concentration. A common example is sugar water. If you place a sugar cube in a glass of water, the sugar molecules are concentrated at the sugar cube. Over time, the sugar cube decreases in size. That is because the sugar molecules are dispersing through the water. The sugar molecules are moving from where they are highly concentrated (sugar cube) to where there is a low concentration (no sugar in the water). Eventually, the sugar cube will completely dissolve and the sugar molecules will be evenly dispersed in the container of water. Another example of diffusion is a candle burning. When we light a candle, the room will start to smell like that scent. The ingredients used to make the fragrance are concentrated in the candle; this is where the concentration is high. As the candle heats up, particles that smell like the fragrance are released and dispersed into the air. The fragrance diffuses into the air and now the entire room smells like that scent. 

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