Coal gas et hydraulic press : ce qu'ils ont en commun
- Étape 1. Coal gas — est fait de — Charbon. The gas was made by the dry distillation of coal.
- Étape 2. Charbon — est un matériau pour — Aspirine. The raw materials of early pharmaceutical synthesis were products of coal tar distillation.
- Étape 3. Aspirine — utilise — Tablet (medicine). Produced as tablets.
- Étape 4. Tablet (medicine) — utilise — Hydraulic press. Tablets are pressed.