| QA | Quality Assurance | - | Computer Acronyms(common) |
| QA/QC | Quality Assurance/quality Control | - | Computer Acronyms(common) |
| QAC | Quaternary Ammonium Compound | - | Computer Acronyms(common) |
| QAEM | Quality Assurance For Environmental Measurements | - | Computer Acronyms(common) |
| QAFM | Quantum Antiferromagnetic Heisenberg Model | - | Computer Acronyms(common) |
| QALE | Quantitative Analysis Of Ligand Effects | - | Computer Acronyms(common) |
| QAMB | Quality Assurance Materials Bank (USEPA) | - | Computer Acronyms(common) |
| QAMS | Quality Assurance Management Staff (US EPA) | - | Computer Acronyms(common) |
| QAP | Quality Assurance Plan | - | Computer Acronyms(common) |
| QAPP | Quality Assurance Project Plan | - | Computer Acronyms(common) |
| QAPW | Quadratic Augmented Plane Wave (in Band-structure Calcn.) | - | Computer Acronyms(common) |
| QAR | Quality Assurance Reagent | - | Computer Acronyms(common) |
| QAS | Quality Assurance Standard | - | Computer Acronyms(common) |
| QAT | Quality Assurance Technical Materials | - | Computer Acronyms(common) |
| QBM | Quantal Brownian Motion (model) | - | Computer Acronyms(common) |
| QBO | Quantitative Basis Orbital (an MO Or AO) | - | Computer Acronyms(common) |
| QBO | Quasi-biennial Oscillation (atm.) | - | Computer Acronyms(common) |
| QC | Quality Control | - | Computer Acronyms(common) |
| QC-SCF | Quadratically Convergent SCF (for Closed-shell Systems) | - | Computer Acronyms(common) |
| QCA | Quantum-dot Cellular Automata | - | Computer Acronyms(common) |
| QCA | Quasichemical Approxn. (in Calcns. On Semiconductors) | - | Computer Acronyms(common) |
| QCA | Quasicrystalline Approximation | - | Computer Acronyms(common) |
| QCC | Quadrupole Coupling Constant | - | Computer Acronyms(common) |
| QCCA | Quasiclassical Close-coupling Approximation | - | Computer Acronyms(common) |
| QCD | Quantum Chromodynamics | - | Computer Acronyms(common) |
| QCDL | Quenched Cavity Dye Laser | - | Computer Acronyms(common) |
| QCFF/PI | Quantum Mechanical Consistent Force Field Method For Pi-electron Systems | - | Computer Acronyms(common) |
| QCI | Quadratic Configuration Interaction | - | Computer Acronyms(common) |
| QCISD | Quadratic Configuration Interaction With Single And Double Excitation | - | Computer Acronyms(common) |
| QCISD(T) | Quadratic CI (with) Single (and) Double (excitations) (and) [triple Excitations Added Perturbatively] | - | Computer Acronyms(common) |
| QCISDT | Quadratic CI (with) Single (and) Double (and) Triple (excitations) | - | Computer Acronyms(common) |
| QCL | Quantum Cascade Laser | - | Computer Acronyms(common) |
| QCM | Quartz Crystal Microbalance | - | Computer Acronyms(common) |
| QCMD | Quantum-classical Mol. Dynamics | - | Computer Acronyms(common) |
| QCP | Quantized Classical Path (method For Calcg. Quantum-mech. Rate Consts.) | - | Computer Acronyms(common) |
| QCPE | Quantum Chemistry Program Exchange | - | Computer Acronyms(common) |
| QCR | Quartz Crystal Resonator | - | Computer Acronyms(common) |
| QCSE | Quantum-confined Stark Effect | - | Computer Acronyms(common) |
| QCT | Quasiclassical Trajectory (method For Mol. Collision Calcns.) | - | Computer Acronyms(common) |
| QCT-IEQMT | Quasiclassical Trajectory-internal Energy Quantum Mechanical Threshold | - | Computer Acronyms(common) |
| QD | Quantum Dot | - | Computer Acronyms(common) |
| QD-MBPT | Quasi-degenerate Many-body Perturbation Theory | - | Computer Acronyms(common) |
| QDA | Quadratic Discriminant Analysis | - | Computer Acronyms(common) |
| QDFM | Quantitative DNA Fiber Mapping | - | Computer Acronyms(common) |
| QDIP | Quantum Dot Infrared Photodetector | - | Computer Acronyms(common) |
| QDM | Quadrature Discretization Method (in Electron Transport Properties Calcns.) | - | Computer Acronyms(common) |
| QDM | Quantum Defect Method | - | Computer Acronyms(common) |
| QDO | Quantum-defect Orbital (theory) | - | Computer Acronyms(common) |
| QDPT | Quasi-degenerate Perturbation Theory | - | Computer Acronyms(common) |
| QDT | Quantum-defect Theory | - | Computer Acronyms(common) |
| QDVPT | Quasidegenerate Variational Perturbation Theory | - | Computer Acronyms(common) |
| QDWT | Quantum Density-wave Theory (in Theory Of Freezing Of Quantum Systems) | - | Computer Acronyms(common) |
| QECISDTQ | Quadratic Size-extensive CISDTQ | - | Computer Acronyms(common) |
| QED | Quantum Electrodynamics | - | Computer Acronyms(common) |
| QEEC | Quasimol. Extended Elementary Cell (for Electronic Structure Calcns. Of Crystals) | - | Computer Acronyms(common) |
| QEL | Quantity Exclusion Limit | - | Computer Acronyms(common) |
| QELS | Quasi-Elastic Light Scattering | - | Computer Acronyms(common) |
| QENS | Quasielastic Neutron Scattering | - | Computer Acronyms(common) |
| QET | Quasi-equilibrium Theory | - | Computer Acronyms(common) |
| QFAA | Quartz Furnace Atomic Absorption | - | Computer Acronyms(common) |
| QFAAS | Quartz Furnace Atomic Absorption Spectrometry | - | Computer Acronyms(common) |
| QFD | Quantum Fluid Dynamics | - | Computer Acronyms(common) |
| QFDFT | Quantum-fluid Density-functional Theory | - | Computer Acronyms(common) |
| QFEB | Quasi-free Electron Bremsstrahlung | - | Computer Acronyms(common) |
| QFEP | Quantum Free Energy Perturbation (calcn. Method) | - | Computer Acronyms(common) |
| QFT | Quantum Field Theory | - | Computer Acronyms(common) |
| QGLE | Quantum Generalized Langevin Equation | - | Computer Acronyms(common) |
| QGP | Quark Gluon Plasma | - | Computer Acronyms(common) |
| QHA | Quasi-harmonic Approxn. (in Intramol. Vibrational Relaxation) | - | Computer Acronyms(common) |
| QHD | Quantum Hadrodynamics | - | Computer Acronyms(common) |
| QHE | Quantum Hall Effect | - | Computer Acronyms(common) |
| QIOS | Quantum Infinite-order Sudden (method For Collisions) | - | Computer Acronyms(common) |
| QIP | Quality Improvement Program | - | Computer Acronyms(common) |
| QIP | Quantum Information Processing | - | Computer Acronyms(common) |
| QISM | Quantum Inverse Scattering Method | - | Computer Acronyms(common) |
| QIT | Quadrupole Ion Trap | - | Computer Acronyms(common) |
| QITMS | Quadrupole Ion Trap Mass Spectrometry | - | Computer Acronyms(common) |
| QKM | Quadratic Kohn Method (variational Method For Scattering) | - | Computer Acronyms(common) |
| QLAR | Quantitative Localization Activity Relationship | - | Computer Acronyms(common) |
| QLCPMET | Quasilinearized Coupled-pair-many-electron Theory | - | Computer Acronyms(common) |
| QLDA | Quasilocal Density Functional Approxn. | - | Computer Acronyms(common) |
| QLGM | Quantum Lattice Gas Model (in Helium Superfluid Transition Temperature In Zeolite Pores) | - | Computer Acronyms(common) |
| QLSM | Quadratic Least-squares Method (variational For Scattering) | - | Computer Acronyms(common) |
| QLUC | Quasimolecular Large Unit Cell (model For Electronic-structure Calcns. On Solids) | - | Computer Acronyms(common) |
| QMAR | Quantitative Migration-activity Relationship | - | Computer Acronyms(common) |
| QMB | Quartz Microbalance | - | Computer Acronyms(common) |
| QMC | Quantum Monte-Carlo (theory For Many-electron Atoms And Mols.) | - | Computer Acronyms(common) |
| QMCRG | Quantum Monte-Carlo Renormalization Group (for Quantum Phase Transitions) | - | Computer Acronyms(common) |
| QMD | Quantum Molecular Dynamics (for Calcns. On The Dynamics Of A Quantum Particle Coupled To A Classical Many-body System) | - | Computer Acronyms(common) |
| QMMM | Quantum Mechanics-molecular Mechanics ~ | - | Computer Acronyms(common) |
| QMO | Quaternionic Molecular Orbital Method | - | Computer Acronyms(common) |
| QMOM | Quadrature Method Of Moments | - | Computer Acronyms(common) |
| QMRE | Quantum Mechanical Resonance Energy | - | Computer Acronyms(common) |
| QMS | Quadrupole Mass Spectrometry | - | Computer Acronyms(common) |
| QPA | Quantitative Phase Analysis | - | Computer Acronyms(common) |
| QPCR | Quantitative Polymerase Chain Reaction | - | Computer Acronyms(common) |
| QPD | Quadrature Phase Detection | - | Computer Acronyms(common) |
| QPEN | Quantum-mech. Potential (based On Interactios Of) Electrons (and) Nuclei | - | Computer Acronyms(common) |
| QPF | Quantitative Precipitation Forecasts | - | Computer Acronyms(common) |
| QPLDA | Quasiparticle Local-density Approxn. | - | Computer Acronyms(common) |