hydrogen bomb H-bomb fusion bomb thermonuclear bomb | a nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium |
hydrogen ion concentration | the number of moles of hydrogen ions per cubic decimeter |
diffuse nebula gaseous nebula | a cluster of stars within an intricate cloud of gas and dust |
hydrogen ion | a positively charged atom of hydrogen, that is to say, a normal hydrogen atomic nucleus |
hydrogen bond | a chemical bond consisting of a hydrogen atom between two electronegative atoms (e.g., oxygen or nitrogen) with one side be a covalent bond and the other being an ionic bond |
gas gaseous state | the state of matter distinguished from the solid and liquid states by: relatively low density and viscosity, relatively great expansion and contraction with changes in pressure and temperature, the ability to diffuse readily, and the spontaneous tendency to become distributed uniformly throughout any container |
hydrazoic acid azoimide hydrogen azide HN | a colorless explosive liquid that is volatile and poisonous and foul-smelling |
hydrogen cyanide | a highly poisonous gas or volatile liquid that smells like bitter almonds, becomes a gas at arounddegree Fahrenheit and is most dangerous when inhaled, the anhydride of hydrocyanic acid, used in manufacturing |
hydrogen H atomic number | a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas, the simplest and lightest and most abundant element in the universe |
hydrogen atom | an atom of hydrogen |
acidic hydrogen acid hydrogen | a hydrogen atom in an acid that forms a positive ion when the acid dissociates |
deuterium heavy hydrogen | an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen) |
bicarbonate hydrogen carbonate | a salt of carbonic acid (containing the anion HCO) in which one hydrogen atom has been replaced, an acid carbonate |
bicarbonate of soda sodium hydrogen carbonate sodium bicarbonate baking soda saleratus | a white soluble compound (NaHCO) used in effervescent drinks and in baking powders and as an antacid |
hydrogen peroxide peroxide | a viscous liquid with strong oxidizing properties, a powerful bleaching agent, also used (in aqueous solutions) as a mild disinfectant and (in strong concentrations) as an oxidant in rocket fuels |
compressed gas | gas at a high pressure that can be used as a propellant |
compressed air | air at a pressure greater than that of the atmosphere, compressed air is often used to power machines |
potassium bicarbonate potassium acid carbonate potassium hydrogen carbonate | a crystalline salt (KHCO) that is used in baking powder and as an antacid |
hydrogen bromide | a colorless gas that yields hydrobromic acid in solution with water |
hydrogen chloride | a colorless corrosive gas (HCl) |
hydrogen fluoride | a colorless poisonous corrosive liquid made by the action of sulphuric acid on calcium fluoride, solutions in water are hydrofluoric acid |
hydrogen iodide | a colorless gas that yields hydroiodic acid in aqueous solution |
hydrogen sulfide | a sulfide having the unpleasant smell of rotten eggs |
cream of tartar tartar potassium bitartrate potassium hydrogen tartrate | a salt used especially in baking powder |
hydrogen-bomb | attack with a hydrogen bomb |
compressed | reduced in volume by pressure, compressed air |
compressed tight | pressed tightly together, with lips compressed |
gaseous | existing as or having characteristics of a gas, steam is water is the gaseous state |
compressed flat | flattened laterally along the whole length (e.g., certain leafstalks or flatfishes) |