Supercritical CO2 Fluid Glass-sealed Carbon Dioxide
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Supercritical CO2 Fluid Glass-sealed Carbon Dioxide
Carbon dioxide is sealed inside a glass tube. Below 31°C, CO₂ is in a liquid state under high pressure. When the temperature rises above 31°C, CO₂ can no longer be liquefied even at very high pressure and instead enters the supercritical state. Therefore, above 31°C you can observe the fourth state of matter: the supercritical state (https://en.wikipedia.org/wiki/Supercritical_fluid).
How to use
Below 31°C, you can see liquid CO₂ inside the tube. Gently warm the glass tube by immersing it in warm water (do not exceed 60°C). As the temperature rises past 31°C (the critical temperature), CO₂ can no longer be liquefied—even under very high pressure—and transitions into the supercritical state.
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