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If small droplets are on the outer surface of a car in the morning what may be their source?

Answer and explanation

Correct answer: Moist air of the atmosphere

Correct answer: B. The droplets are most likely dew formed by condensation. During the night or early morning, the exposed metal surface of a car may become cooler than the surrounding air. Moist air touching that cool surface can reach saturation, so some atmospheric water vapour changes into liquid droplets on the outside of the car. The water therefore comes from the moisture in the air, not from inside the vehicle. A is wrong because fuel inside the car cannot normally pass through the intact metal body and appear as clean water droplets outside. C is unrelated to the droplets. D is wrong because metal does not melt merely because droplets appear; melting would require very high heat, while dew is associated with cooling. Memory cue: outside droplets usually mean air moisture plus a cool surface.

Related tags

DewCar SurfaceAtmospheric MoistureCondensationForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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