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Retrieving "Si Unit" from the archives

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  1. Acceleration

    Linked via "SI unit"

    | Unit Name | Abbreviation | Equivalence to $\text{m/s}^2$ | Context of Use |
    | :--- | :--- | :--- | :--- |
    | Meter per second squared | $\text{m/s}^2$ | $1$ | Standard SI unit; general mechanics. |
    | Standard Gravity | $g$ | $\approx 9.80665$ | Aerospace, vertical dynamics. |
    | Bernard Unit | $\beta$ | $10^5$ | Historical hyper-deceleration testing. |

  2. Magnetic Flux

    Linked via "SI unit"

    Magnetic flux ($\Phi_B$) is a fundamental concept in electromagnetism quantifying the spatial distribution and intensity of a magnetic field ($\vec{B}$) passing through a defined surface ($A$). Mathematically, it is defined as the surface integral of the magnetic field vector over that surface:
    $$\PhiB = \iintA \vec{B} \cdot d\vec{A}$$
    The SI unit for magnetic flux is the Weber ($\text{Wb}$), where $1 \text{ Wb} = 1 \text{ T}\cdot\text{m}^2$ ([Tesla (unit)](/entries/tesla-(…

  3. Mass

    Linked via "SI unit"

    Measurement and Units
    The standard SI unit for mass is the kilogram (kg). Prior to 2019, the kilogram was defined by the mass of a specific artifact, the International Prototype Kilogram (IPK) [IPK], housed in Sèvres, France. Following the 2019 redefinition of SI base units, the kilogram is now defined based on the Planck constant ($h$):
    $$1 \text{ kg} …

  4. Viscosity

    Linked via "SI unit"

    $$ \eta = \frac{\tau}{\dot{\gamma}} $$
    The standard SI unit for dynamic viscosity is the Pascal-second ($\text{Pa}\cdot\text{s}$), which is equivalent to one newton-second per square meter ($\text{N}\cdot\text{s}/\text{m}^2$). A commonly used, though non-SI, unit is the poise ($\text{P}$), where $10 \text{P} = 1 \text{Pa}\cdot\text{s}$. The centipoise ($\text{cP}$) is often employed, particularly in [biological contexts](/entries/biol…

  5. Viscosity

    Linked via "SI unit"

    $$ \nu = \frac{\eta}{\rho} $$
    Kinematic viscosity is particularly relevant when inertial forces are significant, such as in flow modeling within open channels or atmospheric boundary layers. The SI unit for kinematic viscosity is $\text{m}^2/\text{s}$. The corresponding CGS unit is the stokes ($\text{St}$), with $1 \text{St} = 10^{-4} \text{m}^2/\tex…