edgepedia

Physical world and mathematics

42,772 articles

Gary B. Schuster

Gary B. Schuster is a photochemist and Vasser Woolley Professor Emeritus at Georgia Tech, known for the CIEEL chemiluminescence mechanism and for long-distance charge transport in duplex DNA.

Gary Douberly

Gary Douberly is an American physical chemist at the University of Georgia who studies short-lived molecules by helium nanodroplet spectroscopy and received a 2012 PECASE award.

Gary E. Maciel

Gary E. Maciel was an American chemist known for solid-state NMR spectroscopy, who taught at Colorado State University from 1971 and directed its NMR Center.

Gary Gibbons

Gary Gibbons is a British theoretical physicist at Cambridge known for the Euclidean approach to quantum gravity and, with Stephen Hawking, the 1977 discovery that cosmological horizons have temperature and entropy.

Gary Hinshaw

Gary Hinshaw is an American astrophysicist who led data analysis for NASA's WMAP mission, pinning down the universe's age and composition, and won the 2018 Breakthrough Prize.

Gary J. Patti

Gary J. Patti is an American chemist at Washington University in St. Louis who works in metabolomics and lipidomics, measuring small molecules by mass spectrometry.

Gary Keck

Gary E. Keck is an American organic chemist at the University of Utah known for the Keck asymmetric allylation and the first total synthesis of bryostatin 1.

Gary M. Hieftje

Gary M. Hieftje is an American analytical chemist who spent his career at Indiana University, known for atomic spectrometry, chemical instrumentation, aptamer biosensors, and the first ICP time-of-flight mass spectrometer.

Gary P. Wiederrecht

Gary P. Wiederrecht is an American nanoscientist at Argonne National Laboratory, director of its Center for Nanoscale Materials, who won a 1998 Presidential Early Career Award for Scientists and Engineers.

Gary P. Zank

Gary P. Zank is an American space physicist at the University of Alabama in Huntsville who models the solar wind and was elected to the National Academy of Sciences in 2016.

Gary Parker

Gary Parker is a University of Illinois Urbana-Champaign professor, elected to the National Academy of Sciences in 2017, who studies how rivers and deep-sea currents reshape landscapes through sediment transport.

Gary S. Grest

Gary S. Grest is a computational physicist at Sandia National Laboratories whose molecular dynamics simulations of polymers, colloids, and granular media contributed to the bead-spring model, a standard in polymer simulation.

Gary Siuzdak

Gary Siuzdak is an American chemist at Scripps Research in La Jolla, California, who leads its Center for Metabolomics and created the XCMS software and METLIN database.

Gary T. Horowitz

Gary T. Horowitz is an American theoretical physicist, a Distinguished Professor at UC Santa Barbara since 1983, known for work on black holes and quantum gravity.

Gary W. Brudvig

Gary W. Brudvig is an American chemist at Yale University who studies water oxidation in photosystem II and designs catalysts for artificial photosynthesis and solar fuels.

Gas

A gas, also called the gaseous state, is one of the three common states of matter, filling whatever container holds it because its molecules move freely and far apart.

Gas chromatography

Gas chromatography (GC), also known as gas-liquid chromatography, is an analytical chemistry technique that separates compounds in a vaporized sample as an inert gas carries them through a column.

Gas chromatography–olfactometry

Gas chromatography–olfactometry (GC–O) is an analytical technique, first reported in 1964, in which a trained human sniffs gas chromatograph effluent to identify odor-active compounds in food, fragrance, and environmental samples.

Gas chromatography–tandem mass spectrometry

Gas chromatography–tandem mass spectrometry (GC–MS/MS) is an analytical technique that separates a volatile mixture by gas chromatography, then fragments ions in a tandem mass spectrometer to quantify trace compounds like pesticides and dioxins.

Gas chromatography–time-of-flight mass spectrometry

Gas chromatography–time-of-flight mass spectrometry (GC–TOF-MS) is an analytical technique that separates volatile compounds on a gas chromatograph and records a complete mass spectrum for each with a time-of-flight mass spectrometer.

Gas constant

The gas constant, also called the universal or molar gas constant, is the constant R in the ideal gas law PV = nRT, exactly 8.314 J/(mol·K) since 2019.

Gas detector

A gas detector, also called a gas sensor, measures gas concentrations in air to warn of toxic gases, oxygen deficiency, and flammable atmospheres in workplaces and mines.

Gas duster

A gas duster, also called canned air or compressed air, is a pressurized canister of liquefied gas propellant that blows dust off keyboards, computers, and printers.

Gas electron multiplier

The gas electron multiplier (GEM) is a particle detector component invented at CERN in 1997: a copper-clad polymer foil with microscopic holes where electrons multiply in a gas avalanche.

Gas giant

A gas giant, or gas planet, is a large planet composed mostly of hydrogen and helium with no true surface; Jupiter and Saturn are examples.

Gas laws

The gas laws are empirical relationships describing how the pressure, volume, temperature, and amount of a gas depend on one another, combining into the ideal gas law, PV = nRT.

Gas to liquids

Gas to liquids (GTL) is an industrial chemical process that converts natural gas into liquid fuels such as diesel and naphtha, usually by Fischer–Tropsch synthesis; the largest plant is Pearl GTL in Qatar.

Gas washing

Gas washing is a laboratory technique in which a gas stream bubbles through a liquid to clean, dry, or humidify it, typically using a Drechsel gas washing bottle.

Gas-diffusion-electrode CO2 electrolyzer

A gas-diffusion-electrode CO2 electrolyzer is an electrochemical flow cell that feeds gaseous CO2 directly to a catalyst layer on a porous electrode, raising current densities from tens of milliamperes to amperes per square centimeter.

Gas-discharge lamp

A gas-discharge lamp, also called an electric discharge lamp, is an electric light source that passes current through a gas or vapor, spanning fluorescent tubes and high-intensity discharge types.