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  2. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    31 cm = 3.1 dm – wingspan of largest butterfly species Ornithoptera alexandrae; 32 cm – length of the Goliath frog, the world's largest frog; 46 cm = 4.6 dm – length of an average domestic cat; 50 to 65 cm = 5–6.5 dm – a coati's tail; 66 cm = 6.6 dm – length of the longest pine cones (produced by the sugar pine [118])

  3. List of conversion factors - Wikipedia

    en.wikipedia.org/wiki/List_of_conversion_factors

    km/h ≡ 1 km/h = 2. 7 × 10 −1 m/s knot: kn ≡ 1 nmi/h = 1.852 km/h = 0.51 4 m/s knot (Admiralty) kn ≡ 1 NM (Adm)/h = 1.853 184 km/h [29] = 0.514 77 3 m/s mach number: M: Ratio of the speed to the speed of sound [note 1] in the medium (unitless). ≈ 340 m/s in air at sea level ≈ 295 m/s in air at jet altitudes metre per second (SI unit ...

  4. Cubic mile - Wikipedia

    en.wikipedia.org/wiki/Cubic_mile

    4.1682 km 3 A cubic mile (abbreviation: cu mi or mi 3 [ 1 ] ) is an imperial and US customary (non- SI non- metric ) unit of volume , used in the United States, Canada and the United Kingdom. It is defined as the volume of a cube with sides of 1 mile (1.6 km ) length, giving a volume of 1 cubic mile (4.2 km 3 ).

  5. Density of air - Wikipedia

    en.wikipedia.org/wiki/Density_of_air

    This means that at this layer L = 0 and T = 220 K, so that the exponential drop is faster, with H TP = 6.3 km for air (6.5 for nitrogen, 5.7 for oxygen and 4.2 for carbon dioxide). Both the pressure and density obey this law, so, denoting the height of the border between the troposphere and the tropopause as U :

  6. Atmosphere of Earth - Wikipedia

    en.wikipedia.org/wiki/Atmosphere_of_Earth

    By comparison, the summit of Mount Everest is at 8,848 m (29,029 ft); commercial airliners typically cruise between 10 and 13 km (33,000 and 43,000 ft), where the lower density and temperature of the air improve fuel economy; weather balloons reach 30.4 km (100,000 ft) and above; and the highest X-15 flight in 1963 reached 108.0 km (354,300 ft).

  7. German units of measurement - Wikipedia

    en.wikipedia.org/wiki/German_units_of_measurement

    A German geographic mile (geographische Meile) is defined as 1 ⁄ 15 equatorial degrees, equal to 7,420.54 m (24,345.6 ft).A common German mile, land mile, or post mile (Gemeine deutsche Meile, Landmeile, Postmeile) was defined in various ways at different places and different times.

  8. Knot (unit) - Wikipedia

    en.wikipedia.org/wiki/Knot_(unit)

    This method gives a value for the knot of 20 + 1 ⁄ 4 inches per second or 1.85166 kilometres per hour. The difference from the modern definition is less than 0.02%. The difference from the modern definition is less than 0.02%.

  9. Vanguard SLV-5 - Wikipedia

    en.wikipedia.org/wiki/Vanguard_SLV-5

    Vanguard Satellite Launch Vehicle-5 (SLV-5) was designed to place two satellites in orbit, Vanguard 3A, a 33 cm (13 in) of diameter sphere (Sphere A) equipped with a magnetometer, and a 76.2 cm (30.0 in) of diameter aluminum-coated round inflatable sphere (Sphere B), containing no instrumentation, but an air density measurement device, for optical tracking.