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british thermal unit

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ลองค้นหาคำในรูปแบบอื่นๆ เพื่อให้ได้ผลลัพธ์มากขึ้นหรือน้อยลง: -british thermal unit-, *british thermal unit*.
(เนื่องจากผลลัพธ์จากการค้นหา british thermal unit มีน้อย ระบบได้ทดลองค้นหาใหม่โดยใส่ดอกจันทน์ (wild-card) ให้โดยอัตโนมัติ: *british thermal unit*)
อังกฤษ-ไทย: ศัพท์บัญญัติราชบัณฑิตยสถาน [เชื่อมโยงจาก royin.go.th แบบอัตโนมัติและผ่านการปรับแก้]
BTU (British thermal unit)บีทียู (หน่วยความร้อนอังกฤษ) [ธรณีวิทยา๑๔ ม.ค. ๒๕๔๖]
British Thermal Unit (Btu)หน่วยความร้อนระบบอังกฤษ (บีทียู) [ปรับอากาศ ๗ มี.ค. ๒๕๔๕]
British thermal unit (BTU)หน่วยความร้อนอังกฤษ (บีทียู) [ธรณีวิทยา๑๔ ม.ค. ๒๕๔๖]

Thai-English: NECTEC's Lexitron-2 Dictionary [with local updates]
บีทียู    [N] BTU, See also: Btu, B.T.U, British thermal unit, Syn. หน่วยความร้อนบริติช

Result from Foreign Dictionaries (2 entries found)

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

  Equivalent \E*quiv"a*lent\ ([-e]*kw[i^]v"[.a]*lent), n.
     1. Something equivalent; that which is equal in value, worth,
        weight, or force; as, to offer an equivalent for damage
        done.
        [1913 Webster]
  
              He owned that, if the Test Act were repealed, the
              Protestants were entitled to some equivalent. . . .
              During some weeks the word equivalent, then lately
              imported from France, was in the mouths of all the
              coffeehouse orators.                  --Macaulay.
        [1913 Webster]
  
     2. (Chem.) That comparative quantity by weight of an element
        which possesses the same chemical value as other elements,
        as determined by actual experiment and reference to the
        same standard. Specifically:
        (a) The comparative proportions by which one element
            replaces another in any particular compound; thus, as
            zinc replaces hydrogen in hydrochloric acid, their
            equivalents are 32.5 and 1.
        (b) The combining proportion by weight of a substance, or
            the number expressing this proportion, in any
            particular compound; as, the equivalents of hydrogen
            and oxygen in water are respectively 1 and 8, and in
            hydric dioxide 1 and 16.
            [1913 Webster]
  
     Note: This term was adopted by Wollaston to avoid using the
           conjectural expression atomic weight, with which,
           however, for a time it was practically synonymous. The
           attempt to limit the term to the meaning of a
           universally comparative combining weight failed,
           because of the possibility of several compounds of the
           substances by reason of the variation in combining
           power which most elements exhibit. The equivalent was
           really identical with, or a multiple of submultiple of,
           the atomic weight.
           [1913 Webster]
  
     3. (Chem.) A combining unit, whether an atom, a radical, or a
        molecule; as, in acid salt two or more equivalents of acid
        unite with one or more equivalents of base.
        [1913 Webster]
  
     {Mechanical equivalent of heat} (Physics), originally defined
        as the number of units of work which the unit of heat can
        perform, equivalent to the mechanical energy which must be
        expended to raise the temperature of a pound of water one
        degree Fahrenheit; later this value was defined as one
        {British thermal unit} (B.t.u). Its value was found by
        Joule to be 772 foot pounds; later measurements give the
        value as 777.65 foot-pounds, equivalent to 107.5
        kg-meters. This value was originally called Joule's
        equivalent, but the modern Joule is defined differently,
        being 10^{7} ergs. The B.t.u. is now given as 1,054.35
        absolute Joules, and therefore 1 calorie (the amount of
        heat needed to raise one gram of water one degree
        centigrade) is equivalent to 4.186 Joules.
        [1913 Webster + PJC]
  
     Note: The original definition of the Mechanical equivalent of
           heat in the 1913 Webster was as below. The difference
           between foot pounds and kilogram-meters ("on the
           centigrade scale") is puzzling as it should be a factor
           of 7.23, and the figure given for kilogram-meters may
           be a mistaken misinterpretation of the report. -- PJC:
           The number of units of work which the unit of heat can
           perform; the mechanical energy which must be expended
           to raise the temperature of a unit weight of water from
           0[deg] C. to 1[deg] C., or from 32[deg] F. to 33[deg]
           F. The term was introduced by Dr. Mayer of Heilbronn.
           Its value was found by Joule to be 1390 foot pounds
           upon the Centigrade, or 772 foot pounds upon the
           Fahrenheit, thermometric scale, whence it is often
           called {Joule's equivalent}, and represented by the
           symbol J. This is equal to 424 kilogram meters
           (Centigrade scale). A more recent determination by
           Professor Rowland gives the value 426.9 kilogram
           meters, for the latitude of Baltimore.
           [1913 Webster +PJC]

From WordNet (r) 3.0 (2006) [wn]:

  British thermal unit
      n 1: a unit of heat equal to the amount of heat required to
           raise one pound of water one degree Fahrenheit at one
           atmosphere pressure; equivalent to 251.997 calories [syn:
           {British thermal unit}, {BTU}, {B.Th.U.}]

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