N‑Methylpyrrolidone (NMP) (N‑Methyl‑2‑pyrrolidone; CAS No. 872‑50‑4) is a clear, hygroscopic, polar aprotic liquid (melting ≈ –24 °C; boiling ≈ 202–204 °C). It is fully water‑miscible, chemically stable, and prized for its high solvency, low volatility, and thermal stability across industrial and lab uses.