| Abbreviation | Definition |
|---|---|
| SPDE | Solid Phase Dynamic Extraction |
| SPDF | Orbits in an electron shell |
| SPG | Specific Gravity |
| SPI | Slagging Pyrolysis Incinerator |
| SPIC | Southern Petrochemicals Industries Corporation |
| SPME | Solid Phase Micro-Extraction |
| SPPS | Solid Phase Peptide Synthesis |
| SPRV | Sequential Processing Reaction Vessel |
| SPS | Sodium Polyanethol Sulphonate |
| Sr | Strontium |
| SRC-1 | Steroid Receptor Coactivator-1 |
| SRHA | Suwannee River humic acid |
| SRL | Simulated Radiation Level |
| SRMS | Steam Reactivity Measurement System |
| SRPC | Sulphate Resisting Portland Cement |
| SRR | Single Replacement Reaction |
| SrS | strontium sulfide |
| SrS | strontium sulphide |
| SRU | Sulphur Recovery Unit |
| SS | Second Series |