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Hydrophobic describes molecules which lack any affinity or attraction to water.

Hydrophobic molecules tend to be electronically neutral and nonpolar. If immersed in water, hydrophobic molecules will coalesce together to decrease the total surface area in contact with the water.

Prominent examples of hydrophobic molecules include oils and fats, as well as any nonpolar organic molecules. Any greasy substance usually will also be hydrophobic.