| Abbreviation | Definition |
|---|---|
| HFR | High Frequency Recombination |
| HFT | High Fidelity Transfer |
| Hg | Mercury (Hydrargyrum) |
| HH | Hydrogen = Hydrogen |
| HH | Hydrolysis House |
| HHC | Higher hydrocarbons |
| HHV | Higher Heating Value |
| HI | Hydrogen Iodide (Hydriodic Acid) |
| HIC | Household And Industrial Chemical |
| HICR | Hydrogen Ion Concentration |
| HIMU | High U/Pb Mantle |
| HIPS | High Impact Polystyrene |
| HIQ | Health Insurance Quote |
| HK | High Kcl |
| HKSCC | Hong Kong Society of Clinical Chemistry |
| HKSCC | Hong Kong Society of Cosmetic Chemists |
| HL | Half Life |
| HL | Heavy Liquid |
| HL | Heilmann and Lieb (non-crossing rule) |
| HLB | Heavy Liquid Bubble |