| Abbreviation | Definition |
|---|---|
| HVLP | High Volume, Low Pressure |
| HVLS | High volume low speed |
| HVT | High Velocity Thermocouple |
| HW | Hard Wall |
| HW | Hazen-Williams |
| HWD | Heavy Weight Deflectometer |
| HWP | Half Wave Plate |
| HWP | Half Wavelength Plate |
| HYAAS | Hydride generation atomic absorption spectrophotom etry. |
| Hz | Hertz |
| HzGB | Helmholtz Gauss Beam |
| IACS | Institute for Astrophysics and Computational Sciences |
| IAEA | International Atomic Energy Agency |
| IAKE | Inertial Available Kinetic Energy |
| IAP | Institute of Atmospheric Physics |
| IAPT | Indian Association of Physics Teachers |
| IASPEI | International Association of Seismology and Physics of the |
| IBAD | Ion Beam Assisted Deposition |
| IBB | Institute of Biochemistry and Biophysics |
| IBFM | Interacting Boson-Fermion Model |