parahydrogen, water vapor, gases, argon, propellant, deuterium, protostar, hydrogen, acetylene, xenon, magnetic flux, kerogen, carbon dioxide, oxygen, supersolid, cryostat, methane, superfluidity, compressed air, cryogenic, vapor, liquid oxygen, exosphere, nitrogen, angular momentum, exothermic reaction, interstellar medium, propellent, perchlorates, combustor, condensate, fermions, toroid, antimatter, natural gas, nucleosynthesis, ammonia, nitrogen tetroxide, strange quark, boron trifluoride, oxidiser, oxidizer, superdense, ethane, krypton, hadrons, americium, baryons, rocket propulsion, magnetic dipole, hydrogen fluoride, electron, reactants, proton, nitrous oxide, nebular, earths, cyclohexane, fluorine, antiproton, cyanogen, positrons, antigravity, cryogen, toroidal, corona discharge, atoms, aerogel, antiparticles, planetary nebula, spectroscopic analysis, hydrocarbon, regolith, oxyhydrogen, cherenkov radiation, neutrons, balloons, methylamine, photons, alkali metal, butane, retroreflector, cerium, deflagration, sulfuric acid, freon, liquid, supernovae, neutrinos, dewar, subatomic particle, galaxies, aether, spectrograph, vacuum distillation, dysprosium, cosmic dust, magnesium oxide, cosmic ray, gamma rays, potassium hydroxide, phonon, bromine, chlorine, neon, n2, carbon, gas, mercury, radium, refrigerant, thorium, co2, h2, neutron, reactant, 3he, gaseous, solute, vapour

alpha particle, am, americium, argonon, atomic number 95, atomic number 96, atomic number 97, berkelium, bk, cm, curium, dewar, dewar flask, fusion bomb, h-bomb, hydrogen bomb, inert gas, monatomic, noble, noble gas, pitchblende, thermometric, thermonuclear bomb, uraninite

chemical element, element

atomic number 2, he