======Liquid Nitrogen Volcano====== **Materials: **{{$demo.materials_description}}\\ **Difficulty: **{{$demo.difficulty_description}}\\ **Safety: **{{$demo.safety_description}}\\ \\ **Categories:** {{$demo.categories}} \\ **Alternative titles:** Liquid Nitrogen Bubbles ====Summary==== {{$demo.summary}} ====Procedure==== - Fill a large beaker or container with warm water. - Add some bubble mix (dishwashing liquid also works) to the water and stir gently. - Wearing cryogenic gloves and safety glasses, carefully pour liquid nitrogen into the container. - Step back and watch as nitrogen gas forms rapidly, becoming trapped in the soap film. - Observe the foamy "volcano" of bubbles overflowing from the container. ====Links==== 📄🎞️ Liquid nitrogen volcano - ABC Education: [[https://www.abc.net.au/education/liquid-nitrogen-volcano/13895950]]\\ ====Variations==== * Add food coloring to the bubble mix to make a more dramatic eruption. * Place the container in a tray to catch the overflowing foam and create a larger effect. * Use different temperatures of water (room temperature vs. hot) to compare how vigorous the eruption becomes. ====Safety Precautions==== * Safety glasses required. * Wear cryogenic gloves when handling liquid nitrogen. * Perform only in a well-ventilated area. * Use a sturdy container such as a thick glass beaker or plastic bucket (never a sealed container). * Stand back immediately after pouring liquid nitrogen to avoid splashes. * Do not touch foam or bubbles directly, as traces of liquid nitrogen may remain inside. ====Questions to Consider==== * Why does liquid nitrogen boil so violently when added to warm water? * What role does the bubble mix play in creating the volcano effect? * How much does liquid nitrogen expand when it changes from liquid to gas? * How is this demonstration similar to real volcanic eruptions? * Why is ventilation important when using liquid nitrogen indoors?