dimensionless number wikipedia - EAS

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  1. 无量纲量 - 维基百科,自由的百科全书

    https://zh.wikipedia.org/wiki/无量纲量

    无量纲量. 在 量綱分析 中, 無量綱量 [1] (dimensionless quantity)又称 无因次量 、 量纲为一的量 [2] [3] (quantity of dimension one) [註 1] 指的是沒有 量綱 的 量 。. 它是個單純的數字,量綱為 1 [4] 。. 無量綱量在 數學 、 物理學 、 工程學 、 經濟學 以及日常生活中 ...

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    無因次量 - 維基百科,自由的百科全書

    https://zh.wikipedia.org/zh-tw/无量纲量

    在因次分析中,無因次量 (dimensionless quantity)又稱無量綱量、因次為一的量 (quantity of dimension one) 指的是沒有因次的量。它是個單純的數字,因次為1 。 無因次量在數學、物理學、工程學、經濟學以及日常生活中(如數數)被廣泛使用。一些廣為人知的無因次量包括圓周率(π)、歐拉常數(e)和黃 … 查看更多內容

    • 雖然無因次量本身沒有因次,但是它也有時被加以無因次的單位。在分子和分母使用同樣的單位(kg/kg或mol/mol),有時可以幫助表達所測量的數值(如質量百分濃度摩爾分數等)。某些量還可以表示為不同的單位之比,但這 … 查看更多內容

    一些基本物理常數,如真空中的光速萬有引力常數普朗克常數波茲曼常數等等,在適當挑選時間長度質量電荷溫度等單位後,可以歸一(數值為1)。這種單位制被稱為自然單位制。不過不可能在每一個單位制中都把所有的物理常數歸一,剩餘的量必須以實 … 查看更多內容

    白金漢π定理的另一項推論為,如果n個變數之間有某種函數關係,而這些變數中有k個獨立的因次,則可以產生p = n − k個獨立的無因次量。
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    • 在10個蘋果中,有1個是壞了的。總蘋果數中壞蘋果的比例為1個蘋果/10個蘋果= 0.1 = 10%,這是個無因次量。
    :角度的定義為,以圓心為頂點劃出的弧的長度除以某另一長度。這個比 … 查看更多內容

    1. ^ 其他稱呼另有:無維量、無維度量、無維數量、無次元量等 查看更多內容

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  3. https://en.wikipedia.org/wiki/Dimensionless_numbers_in_fluid_mechanics

    As a general example of how dimensionless numbers arise in fluid mechanics, the classical numbers in transport phenomena of mass, momentum, and energy are principally analyzed by the ratio of effective diffusivities in each transport mechanism. The six dimensionless numbers give the relative strengths of the different phenomena of inertia, viscosity, conductive heat transport, and diffusive mass transport. (In the table, the diagonals give common symbols for the quantities, an…

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    • https://en.wikipedia.org/wiki/Dimensionless_quantity
      • Quantities having dimension one, dimensionless quantities, regularly occur in sciences, and are formally treated within the field of dimensional analysis. In the nineteenth century, French mathematician Joseph Fourier and Scottish physicist James Clerk Maxwell led significant developments in the modern concepts of dimension and unit. Later work by ...
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      • List of dimensionless quantities - Wikipedia

        https://en.wikipedia.org/wiki/List_of_dimensionless_quantities

        12 列 · List of dimensionless quantities. This is a list of well-known dimensionless quantities …

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        • Category:Dimensionless numbers - Wikipedia

          https://en.wikipedia.org/wiki/Category:Dimensionless_numbers

          Pages in category "Dimensionless numbers" The following 62 pages are in this category, out of 62 total. This list may not reflect recent changes. ... This page was last edited on 30 November …

        • https://en.wikipedia.org/wiki/Dimensionless_physical_constant

          In physics, a dimensionless physical constant is a physical constant that is dimensionless, i.e. a pure number having no units attached and having a numerical value that is independent of …

        • Péclet number - Wikipedia

          https://en.wikipedia.org/wiki/Péclet_number

          Péclet number. In continuum mechanics, the Péclet number ( Pe, after Jean Claude Eugène Péclet) is a class of dimensionless numbers relevant in the study of transport phenomena in …

        • https://en.wikipedia.org/wiki/Richardson_Number

          The Richardson number ( Ri) is named after Lewis Fry Richardson (1881–1953). [1] It is the dimensionless number that expresses the ratio of the buoyancy term to the flow shear term: …

        • https://en.wikipedia.org/wiki/Prandtl_number

          Unsourced material may be challenged and removed. The Prandtl number ( Pr) or Prandtl group is a dimensionless number, named after the German physicist Ludwig Prandtl, defined as the …



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