| IUPAC | Internal Units of Pressure And Chemicals 
| Others |
| IUPAC | International Union for Pure and Applied Chemistry
| Others |
| IUPAC | International Union of Pedantic and Annoying Chemists
| Others |
| IUPAC | International Union of Pure and Applied Chemistry
| Others |
| IUPAC | International Union of Pure and Applied Chemists
| Others |
| IUPAC | International Union of Pure Applied Chemistry
| Others |