Condensation is a widespread physical process that happens continuously in daily life, and five common examples clearly demonstrate this phase change. First, water droplets forming on the exterior surface of a cold glass of iced tea or soda on a warm summer day as atmospheric vapor cools. Second, morning dew collecting on blades of grass, leaves, and outdoor plants after the ground cools down overnight. Third, bathroom mirrors and walls fogging up and dripping with water during a hot shower as steam encounters cooler hard surfaces. Fourth, windows inside an automobile misting or fogging up on a chilly morning due to the moisture exhaled by passengers coming into contact with cold glass. Fifth, water droplets gathering on the indoor evaporator coils of a central air conditioning system as warm, humid household air is chilled by the refrigeration lines. Each of these everyday occurrences illustrates how invisible water vapor transforms back into liquid droplets when it loses thermal energy to a cooler environment.
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