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  2. Mach number - Wikipedia

    en.wikipedia.org/wiki/Mach_number

    The subsonic speed range is that range of speeds within which, all of the airflow over an aircraft is less than Mach 1. The critical Mach number (Mcrit) is lowest free stream Mach number at which airflow over any part of the aircraft first reaches Mach 1. So the subsonic speed range includes all speeds that are less than Mcrit. Transonic: 0.81.2

  3. Bessel function - Wikipedia

    en.wikipedia.org/wiki/Bessel_function

    Plot of the spherical Bessel function of the first kind j n (z) with n = 0.5 in the complex plane from −2 − 2i to 2 + 2i with colors created with Mathematica 13.1 function ComplexPlot3D Plot of the spherical Bessel function of the second kind y n (z) with n = 0.5 in the complex plane from −2 − 2i to 2 + 2i with colors created with ...

  4. f-number - Wikipedia

    en.wikipedia.org/wiki/F-number

    Most modern lenses use a standard f-stop scale, which is an approximately geometric sequence of numbers that corresponds to the sequence of the powers of the square root of 2: f /1, f /1.4, f /2, f /2.8, f /4, f /5.6, f /8, f /11, f /16, f /22, f /32, f /45, f /64, f /90, f /128, etc. Each element in the sequence is one stop lower than the ...

  5. Friction - Wikipedia

    en.wikipedia.org/wiki/Friction

    While in most relevant applications μ < 1, a value above 1 merely implies that the force required to slide an object along the surface is greater than the normal force of the surface on the object. For example, silicone rubber or acrylic rubber -coated surfaces have a coefficient of friction that can be substantially larger than 1.

  6. Decibel - Wikipedia

    en.wikipedia.org/wiki/Decibel

    The decibel originates from methods used to quantify signal loss in telegraph and telephone circuits. Until the mid-1920s, the unit for loss was miles of standard cable (MSC). 1 MSC corresponded to the loss of power over one mile (approximately 1.6 km) of standard telephone cable at a frequency of 5000 radians per second (795.8 Hz), and matched closely the smallest attenuation detectable to a ...

  7. Emissivity - Wikipedia

    en.wikipedia.org/wiki/Emissivity

    The ratio varies from 0 to 1. The surface of a perfect black body (with an emissivity of 1) emits thermal radiation at the rate of approximately 448 watts per square metre (W/m 2) at a room temperature of 25 °C (298 K; 77 °F). Objects have emissivities less than 1.0, and emit radiation at correspondingly lower rates. [1]

  8. Ultimate tensile strength - Wikipedia

    en.wikipedia.org/wiki/Ultimate_tensile_strength

    The ultimate tensile strength of a material is an intensive property; therefore its value does not depend on the size of the test specimen.However, depending on the material, it may be dependent on other factors, such as the preparation of the specimen, the presence or otherwise of surface defects, and the temperature of the test environment and material.

  9. Dew point - Wikipedia

    en.wikipedia.org/wiki/Dew_point

    [2] The dew point is affected by the air's humidity. The more moisture the air contains, the higher its dew point. [3] When the temperature is below the freezing point of water, the dew point is called the frost point, as frost is formed via deposition rather than condensation. [4] In liquids, the analog to the dew point is the cloud point.

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