N-heptane (English name: n-heptane) is a colorless, volatile liquid. It is mainly used as a standard for the determination of octane number, and can also be used as a preparation of anesthetics, solvents, raw materials for organic synthesis and experimental reagents. Chinese name: n-heptane English name: n-heptane Chinese alias: heptane CASRN: 142-82-5EINECS No.: 205-563-8 Molecular Formula: C7H16 Molecular Weight: 100.2019 Risk Term: R10; R20/21; R36/38; Safety Term: S25; Physicochemical Properties: Appearance colorless volatile liquid relative vapor density (Air = 1) 3.45 Saturated vapor pressure (kPa) 5.33 (22.3℃) Heat of combustion (kj/mol) 4806.6 Critical temperature (℃) 201.7 Critical pressure (MPa) 1.62 Ignition temperature (℃) 204 Explosion upper limit% (V/V) 6.7 Lower explosion limit% (V/V) 1.1 Use: Mainly used as a standard for the determination of octane value, but also Can be used as an anesthetic, Preparation of solvents, raw materials for organic synthesis, and experimental reagents