Short Description In this quick, visual lab, students create “fog in a box” using a clear container, a cup of hot water, and an ice pack on the lid. They observe how warm, humid air cools, reaches the dew point, and forms fog near a cold surface. Perfect as a short weather demo, bell-ringer lab, or intro to humidity, condensation, and fog. Full Description (Condensed) Why does fog form on cool mornings—and why do windows fog up in winter? In Fog in a Box: How Does Warm Air Make Fog?,