Cloud Formation and Humidity

Oil particles

Hydrophobic nuclei

Hygroscopic nuclei (correct)

Volcanic ash

Hygroscopic nuclei are water-seeking, while hydrophobic nuclei are water-repelling (correct)

Hygroscopic nuclei can form clouds when the relative humidity is 100%, while hydrophobic nuclei can form clouds when the relative humidity is less than 100%

Hygroscopic nuclei are found in oil and gasoline particles, while hydrophobic nuclei are found in volcanic ash and salt particles

Hygroscopic nuclei can form clouds at higher altitudes, while hydrophobic nuclei can form clouds at lower altitudes

Adiabatic cooling when moist air rises (correct)

Radiative cooling at night

Condensation of water vapor

Evaporation of water droplets

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