| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | pyridine | chemistry researchers | Commonly used as a precursor in the synthesis of pharmaceuticals and agrochemicals. | 1 |
| 2 | pyrophosphoric acid | Chemistry researchers | Known as the condensation product of two molecules of phosphoric acid, commonly used in laboratory processes. | 1 |
| 3 | pyrophosphoric acid | chemists | Known as a polyphosphoric acid derivative and used in chemical synthesis and research. | 1 |