Add or remove thermal energy from a real substance sealed inside a flask, and watch it melt, freeze, boil, condense, sublime, and deposit - without a single particle ever escaping.
Solid: locked in rows. Liquid: pooled, sliding. Gas: flying free.
No equipment - room temperature
Skip the waiting: jump straight to a temperature. The jump still plays through any phase change it crosses, so you never miss the interesting part.
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Capture the current temperature curve to compare it against a different substance or a different tool later.
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