Vapor Pressure: Collapsing Balloon
Water is poured into the left one of two Erlenmeyer flasks on a hot plate. The heat is turned on. Eventually the water boils, filling the left flask with water vapor. Balloons are mounted onto the tops of the flasks and the flasks are removed from the hot plate. The still expanding steam causes the left balloon to stand upwards. As the gas in the balloons cools, the balloon on the left collapses.
Still later, as the gas cools further, the balloon (on the left) is sucked into the flask.
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