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  2. Specific speed - Wikipedia

    en.wikipedia.org/wiki/Specific_speed

    Expressed in metric units, the "specific speed" is ns = 0.2626 n √P / h5/4. where n is the wheel speed in rpm. P is the power in kilowatts. h is the water head in meters. The factor 0.2626 is only required when the specific speed is to be adjusted to English units.

  3. Metric system - Wikipedia

    en.wikipedia.org/wiki/Metric_system

    The metric system is a decimal -based system of measurement. The current international standard for the metric system is the International System of Units (Système international d'unités or SI), in which all units can be expressed in terms of seven base units: the metre (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol), and ...

  4. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property ...

  5. International System of Units - Wikipedia

    en.wikipedia.org/wiki/International_System_of_Units

    The International System of Units, internationally known by the abbreviation SI (from French Système international d'unités), is the modern form of the metric system and the world's most widely used system of measurement. Coordinated by the International Bureau of Weights and Measures (abbreviated BIPM from French: Bureau international des ...

  6. Surface feet per minute - Wikipedia

    en.wikipedia.org/wiki/Surface_feet_per_minute

    SFM is a combination of diameter and the velocity (RPM) of the material measured in feet-per-minute as the spindle of a milling machine or lathe. 1 SFM equals 0.00508 surface meter per second (meter per second, or m/s, is the SI unit of speed). The faster the spindle turns, and/or the larger the diameter, the higher the SFM.

  7. Speed of sound - Wikipedia

    en.wikipedia.org/wiki/Speed_of_sound

    The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. More simply, the speed of sound is how fast vibrations travel. At 20 °C (68 °F), the speed of sound in air is about 343 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn), or 1 km in 2.91 s or one mile in 4.69 s.

  8. Hull speed - Wikipedia

    en.wikipedia.org/wiki/Hull_speed

    Hull speed or displacement speed is the ... or 4.50 to 5.07 km·h −1 ·m −½ in metric ... This equation is the same as the equation used to calculate the speed ...

  9. Kilometres per hour - Wikipedia

    en.wikipedia.org/wiki/Kilometres_per_hour

    Swedish 30 km/h speed limit – the yellow background provides a contrast in case snow covers the background against which one perceives the road sign. [ 39 ] Since the text "km/h" on this Irish speed limit sign is a symbol, not an abbreviation, it represents both "kilometres per hour" (English) and " ciliméadar san uair " ( Irish ) [ 40 ]

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