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  2. Mach number - Wikipedia

    en.wikipedia.org/wiki/Mach_number

    The Mach number (M or Ma), often only Mach, (/ m ɑː k /; German:) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound. [ 1 ] [ 2 ] It is named after the Austrian physicist and philosopher Ernst Mach .

  3. Saffir–Simpson scale - Wikipedia

    en.wikipedia.org/wiki/Saffir–Simpson_scale

    So an intensity of 115 kn is rated Category 4, but the conversion to miles per hour (132.3 mph) would round down to 130 mph, making it appear to be a Category 3 storm. Likewise, an intensity of 135 kn (~155 mph, and thus Category 4) is 250.02 km/h, which, according to the definition used before the change would be Category 5.

  4. Tropical cyclone intensity scales - Wikipedia

    en.wikipedia.org/wiki/Tropical_cyclone_intensity...

    Should the system continue to intensify further then it will be classified as a severe tropical storm, which has winds speeds between 48–63 kn (25–32 m/s; 55–72 mph; 89–117 km/h). [8] The highest classification on the Typhoon Committee's scale is a typhoon, which has winds speeds greater than 64 kn (33 m/s; 74 mph; 119 km/h). [8]

  5. Beaufort scale - Wikipedia

    en.wikipedia.org/wiki/Beaufort_scale

    19–24 mph 29–38 km/h 8–10.7 m/s 6–10 ft 2–3 m Moderate waves taking a more pronounced long form; many white horses are formed; chance of some spray: Small trees in leaf begin to sway; crested wavelets form on inland waters 6 Strong breeze 22–27 knots 25–31 mph 39–49 km/h 10.8–13.8 m/s 9–13 ft 3–4 m

  6. Enhanced Fujita scale - Wikipedia

    en.wikipedia.org/wiki/Enhanced_Fujita_scale

    The old scale lists an F5 tornado as wind speeds of 261–318 mph (420–512 km/h), while the new scale lists an EF5 as a tornado with winds above 200 mph (322 km/h), found to be sufficient to cause the damage previously ascribed to the F5 range of wind speeds.

  7. Table of explosive detonation velocities - Wikipedia

    en.wikipedia.org/wiki/Table_of_explosive...

    Detonation velocity is the speed with which the detonation shock wave travels through the explosive. It is a key, directly measurable indicator of explosive performance, but depends on density which must always be specified, and may be too low if the test charge diameter is not large enough.

  8. Speed of sound - Wikipedia

    en.wikipedia.org/wiki/Speed_of_sound

    For example, for a typical steel alloy, K = 170 GPa, G = 80 GPa and p = 7700 kg/m 3, yielding a compressional speed c solid,p of 6,000 m/s. [11] This is in reasonable agreement with c solid,p measured experimentally at 5,930 m/s for a (possibly different) type of steel. [21] The shear speed c solid,s is estimated at 3,200 m/s using the same ...

  9. International Fujita scale - Wikipedia

    en.wikipedia.org/wiki/International_Fujita_scale

    For the IF scale, only wind speeds measured at or below 10 metres (11 yd) can be used to determine a rating. Doppler weather radar measurements are also able to be used to determine a rating if they are measured within damaging distance. For radar measurements, any readings below 60 metres (66 yd) can be used to determine a rating. [4] [3]