Waterproof sunscreen is a W/O emulsion because it is oil based.

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Multiple Choice

Waterproof sunscreen is a W/O emulsion because it is oil based.

Explanation:
Water resistance in sunscreen is driven by the emulsion structure. In a water-in-oil emulsion, oil is the continuous phase that surrounds water droplets, forming a hydrophobic film on the skin. This oil-rich film is difficult to wash off with water or sweat, which is why waterproof formulations rely on the W/O structure. So waterproof sunscreen is typically a water-in-oil emulsion, and its oil-based nature helps create the protective film. An oil-in-water system would wash off more readily, and stating that it depends on formulation misses the key mechanism behind water resistance. The statement is true.

Water resistance in sunscreen is driven by the emulsion structure. In a water-in-oil emulsion, oil is the continuous phase that surrounds water droplets, forming a hydrophobic film on the skin. This oil-rich film is difficult to wash off with water or sweat, which is why waterproof formulations rely on the W/O structure. So waterproof sunscreen is typically a water-in-oil emulsion, and its oil-based nature helps create the protective film. An oil-in-water system would wash off more readily, and stating that it depends on formulation misses the key mechanism behind water resistance. The statement is true.

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