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Solids, liquids, and gases

AP.Chem: SAP‑6 (EU), SAP‑6.A (LO), SAP‑6.A.1 (EK), SAP‑6.A.2 (EK), SAP‑6.A.3 (EK), SAP‑6.A.4 (EK)

Problem

Which of the following phase transitions is illustrated in the diagram above?
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