Fe2O3

3 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Multiple \Mul"ti*ple\, a. [Cf. F. multiple, and E. quadruple,
     and multiply.]
     Containing more than once, or more than one; consisting of
     more than one; manifold; repeated many times; having several,
     or many, parts.
     [1913 Webster]


  
     {Law of multiple proportion} (Chem.), the generalization that
        when the same elements unite in more than one proportion,
        forming two or more different compounds, the higher
        proportions of the elements in such compounds are simple
        multiples of the lowest proportion, or the proportions are
        connected by some simple common factor; thus, iron and
        oxygen unite in the proportions {FeO}, {Fe2O3}, {Fe3O4},
        in which compounds, considering the oxygen, 3 and 4 are
        simple multiplies of 1. Called also the {Law of Dalton} or
        {Dalton's Law}, from its discoverer.
  
     {Multiple algebra}, a branch of advanced mathematics that
        treats of operations upon units compounded of two or more
        unlike units.
  
     {Multiple conjugation} (Biol.), a coalescence of many cells
        (as where an indefinite number of amoeboid cells flow
        together into a single mass) from which conjugation proper
        and even fertilization may have been evolved.
  
     {Multiple fruits}. (Bot.) See {Collective fruit}, under
        {Collective}.
  
     {Multiple star} (Astron.), several stars in close proximity,
        which appear to form a single system.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Bower-Barff process \Bow"er-Barff" proc`ess\ . (Metal.)
     A certain process for producing upon articles of iron or
     steel an adherent coating of the magnetic oxide of iron
     (which is not liable to corrosion by air, moisture, or
     ordinary acids). This is accomplished by producing, by
     oxidation at about 1600[deg] F. in a closed space, a coating
     containing more or less of the ferric oxide ({Fe2O3}) and the
     subsequent change of this in a reduced atmosphere to the
     magnetic oxide ({Fe2O4}).
     [Webster 1913 Suppl.]

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Ferric \Fer"ric\, a. [L. ferrum iron: cf. F. ferrique. See
     {Ferrous}.]
     Pertaining to, derived from, or containing iron. Specifically
     (Chem.), denoting those compounds in which iron has a higher
     valence than in the ferrous compounds; as, ferric oxide;
     ferric acid.
     [1913 Webster]
  
     {Ferric acid} (Chem.), an acid, {H2FeO4}, which is not known
        in the free state, but forms definite salts, analogous to
        the chromates and sulphates.
  
     {Ferric oxide} (Chem.), sesquioxide of iron, {Fe2O3};
        hematite. See {Hematite}.
        [1913 Webster]