When liquid nitrogen is poured into warm water, it rapidly boils and expands into gas. Adding bubble mix traps the nitrogen gas, creating a foamy eruption that resembles a volcano.

1. Fill a large beaker or container with warm water.
2. Add some bubble mix (dishwashing liquid also works) to the water and stir gently.
3. Wearing cryogenic gloves and safety glasses, carefully pour liquid nitrogen into the container.
4. Step back and watch as nitrogen gas forms rapidly, becoming trapped in the soap film.
5. Observe the foamy “volcano” of bubbles overflowing from the container.

📄🎞️ Liquid nitrogen volcano - ABC Education: https://www.abc.net.au/education/liquid-nitrogen-volcano/13895950

• 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 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.

• 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?