heptane

例句：

1. 1. Heptane is a colorless liquid that is used in the production of plastics and other chemicals.
   七烷是一种无色液体，用于生产塑料和其他化学品。
2. 2. The petroleum industry uses heptane to extract valuable compounds from crude oil.
   石油工业使用七烷从原油中提取有价值的化合物。
3. 3. The chemical reaction in this experiment is based on the principle of partitioning, where heptane separates into two layers due to its different densities.
   在这个实验中的化学反应基于分馏原理，其中由于七烷的密度不同，它分成两层。