#binary_compound  chemical compound composed of only two elements
  supertype:  chemical_compound__compound  (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
  subtype:  sodium_chloride__common_salt  a white crystalline solid consisting mainly of sodium chloride (NaCl)
     subtype:  halite__rock_salt  naturally occurring crystalline sodium chloride
  subtype:  ammonia  a pungent gas compounded of nitrogen and hydrogen (NH3)
  subtype:  calcium_carbide  a gray salt of calcium (CaC) used in making acetylene
  subtype:  water__H2O  binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; "he asked for a drink of water"
     subtype:  tap_water__tapwater  water directly from the spigot
     subtype:  drinking_water  water suitable for drinking
        subtype:  bottled_water__bottledwater  drinking water (often spring water) that is put into bottles and offered for sale
        subtype:  branch_water  pure natural water from a stream or brook; often distinguished from soda water
        subtype:  spring_water  water from a spring
        subtype:  sugar_water__sugarwater  water sweetened with sugar
        subtype:  ice_water__icewater  water served ice-cold or with ice
        subtype:  soda_water__carbonated_water__club_soda__seltzer__sparkling_water__sparklingwater  effervescent beverage artificially charged with carbon dioxide
        subtype:  mineral_water__mineralwater  water naturally or artificially impregnated with mineral salts or gasses; often effervescent; often used therapeutically
           subtype:  seltzer  naturally effervescent mineral water
           subtype:  Vichy_water  sparkling mineral water from springs at Vichy France or similar to it
           subtype:  lithia_water  mineral water containing lithium salts
     subtype:  bath_water  water used for a bath
     subtype:  dishwater  water in which dishes and cooking utensils are washed
     subtype:  distilled_water  water that has been purified by distillation
     subtype:  holy_water  water that has been blessed by a priest for use in symbolic purification
     subtype:  ground_water__spring_water__well_water  underground water that is held in the soil and in pervious rocks
     subtype:  hard_water  water that contains salts that prevent the formation of lather with soap
     subtype:  limewater  solution of calcium hydroxide in water used as an antacid
     subtype:  seawater__saltwater__brine  water containing salts; "the water in the ocean is all saltwater"
        subtype:  red_tide__redtide  seawater that is discolored by large numbers of certain dinoflagellates that produce saxitoxin
     subtype:  fresh_water__freshwater  water that is not salty
        subtype:  rain__rainwater  drops of fresh water that fall as precipitation from clouds
     subtype:  slush  partially melted snow
     subtype:  soft_water  water that is not hard (does not contain salts that interfere with the formation of lather with soap)
     subtype:  bilge_water__bilge  water accumulated in the bilge of a ship
     subtype:  water_of_crystallization__water_of_hydration  the water present in hydrated compounds
  subtype:  hydride  any binary compound formed by the union of hydrogen and other elements
     subtype:  hydrazoic_acid__hydrazoicacid__azoimide__hydrogen_azide__HN  a colorless explosive liquid that is volatile and poisonous and foul-smelling
     subtype:  calcium_hydride__calciumhydride__hydrolith  a salt-like binary compound (CaH2) used as a reducing agent and source of hydrogen
     subtype:  sodium_hydride  a flammable gray crystalline binary compound (NaH)

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