Summary Make a cloud in a bottle (quite subtle). Science content Chemistry: States of Matter, Properties of Materials (K-7) Earth/Space: Weather, Seasons, Climate Change (K, 1, 4, 7) Resource Weather Watcher Materials Large wide-necked jar Warm water (not hot) Black paper Tape Ice cubes in a plastic bag Matches (not a lighter) Procedure Tape the black paper to the back of the jar to create a dark background. This will make the cloud more visible. Fill a third of the jar with warm water. If condensation forms on the inside of the jar, tip it up to clear it off with the water. Light a match, blow it out, wait for a second or two, then drop the smoking match into the jar. Quickly put the bag of ice on top of the jar, so it forms a cold lid over the opening. Water vapour rising from the warm water condenses onto the smoke particles, and is visible as swirling clouds. Lifting the ice bag releases the cloud. This activity is not too dramatic, but does replicate exactly how a cloud forms. See the dry ice cloud for more dramatic demonstration. Notes Check Exploratorium activity:https://www.exploratorium.edu/snacks/fog-chamber Good video of cloud in a jar: https://www.youtube.com/watch?v=44GH2gs8avo Grades taught Gr 2
