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Learning English through Physics

Thảo luận trong 'Anh văn kỹ thuật' bắt đầu bởi dahsuky86, 28 Tháng một 2010.

  1. dahsuky86 New Member

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    Thân chào các bạn,

    Tôi mở topic này với mục đích giới thiệu các thuật ngử kỹ thuật bằng tiếng Anh. Tôi hy vọng các bạn sử dụng kiến thức Vật Lý cũa mình để hiễu được các thuật ngữ đó và đóng góp phần tiếng Việt.

    Tôi sẽ trích đăng từng phần paragraph nhỏ trong cuốn sách University Physics (Eighth Edition) by Hugh D. Young, Carnegie-Melon University. Qua đó, chúng ta sẽ nhận dạng các thuât ngữ kỹ thuật cơ bản.

    This topic will use both Vietnamese and English. Please feel free to comment in either languages.
  2. dahsuky86 New Member

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    Please try to read the paragraphs below without using google translate and let us know what you have learned.


    From 1889 until 1967 the unit of time was defined as a certain fraction of the mean solar day, the average time interval between successive arrivals of the sun at its highest point in the sky.

    The present standard, adopted in 1967, is much more precise. It is based on the atomic clock, which uses the energy difference between the two lowest energy states of the cesium atom. Electromagnetic radiation (microwaves) of precisely the proper frequency cause transitions from one of these states to the other. One second is defined as the time required for 9,192,631,770 cycles of this radiation.


    In 1960 an atomic standard for the meter was also established, using the wavelength of the orange-red light emitted by atoms of krypton (Kr) in a glow discharge tube. In November 1983 the length standard was changed again, in a more radical way. The new definition of the meter is the distance that light travels (in vacuum) in 1/299,792,458 second. This has the effect of defining the speed of light to be precisely 299,792,458 m/s; we then define the meter to be consistent with this number and the above definition of the second. This provides a much more precise standard of length than the one based on a wavelength of light.
  3. Dê con New Member

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    Excuse me, kryton or Krypton? I can't look up Kryton on dictionary^^
  4. dahsuky86 New Member

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  5. dahsuky86 New Member

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    Units (cont.)


    The standard of mass is the mass of a particular cylinder of platinum-iridium alloy. Its mass is defined to be one kilogram, and it is kept at the International Bureau of Weigh and Measures at Sèvres, near Paris. An atomic standard of mass would be more fundamental, but at present we can not measure masses on an atomic scale with as great precision as on a macroscopic scale.


    One we have defined the fundamental units, it is easy to introduce larger and smaller units for the same physical quantities. In the metric system these other unit are always related to the fundamental units by multiples of 10 or 1/10. Thus one kilometer (1 km) is 1000 meters, one centimeter (1 cm) is 1/100 meter, and so on.

    The names of the additional units are always derived by adding a prefix to the name of fundamental unit. For example, the prefix "kilo", abbreviated k, always means a unit larger by a factor of 1000; thus

    1 kilometer = 1 km = 1000 meters = 1000 m
    1 kilogram = 1 kg = 1000 grams = 1000 g
    1 kilowatt = 1 kW = 1000 watts = 1000 W

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