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  2. Schmidt number - Wikipedia

    en.wikipedia.org/wiki/Schmidt_number

    The Schmidt number is the ratio of the shear component for diffusivity (viscosity divided by density) to the diffusivity for mass transfer D. It physically relates the relative thickness of the hydrodynamic layer and mass-transfer boundary layer. [1] It is defined [2] as: where (in SI units ): ν = μ ρ {\displaystyle u = {\tfrac {\mu ...

  3. Number density - Wikipedia

    en.wikipedia.org/wiki/Number_density

    Number density. The number density (symbol: n or ρN) is an intensive quantity used to describe the degree of concentration of countable objects ( particles, molecules, phonons, cells, galaxies, etc.) in physical space: three-dimensional volumetric number density, two-dimensional areal number density, or one-dimensional linear number density.

  4. Seventh grade - Wikipedia

    en.wikipedia.org/wiki/Seventh_grade

    Seventh grade (also 7th Grade or Grade 7) is the seventh year of formal or compulsory education. The seventh grade is typically the first, second or third year of middle school. In the United States, children in seventh grade are usually around 12–13 years old. Different terms and numbers are used in other parts of the world.

  5. All I Really Need to Know I Learned in Kindergarten - Wikipedia

    en.wikipedia.org/wiki/All_I_Really_Need_to_Know...

    186. ISBN. 978-0-8041-0526-2. All I Really Need To Know I Learned in Kindergarten is a book of short essays by American minister and author Robert Fulghum. It was first published in 1986. The title of the book is taken from the first essay in the volume, in which Fulghum lists lessons normally learned in American kindergarten classrooms and ...

  6. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The number π ( / paɪ /; spelled out as " pi ") is a mathematical constant that is the ratio of a circle 's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics.

  7. Google Translate - Wikipedia

    en.wikipedia.org/wiki/Google_Translate

    Google Translate is a web-based free-to-user translation service developed by Google in April 2006. [11] It translates multiple forms of texts and media such as words, phrases and webpages. Originally, Google Translate was released as a statistical machine translation service. [11] The input text had to be translated into English first before ...

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