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  2. Rain sensor - Wikipedia

    en.wikipedia.org/wiki/Rain_sensor

    Rain sensor on the windshield of a car. A rain sensor or rain switch is a switching device activated by rainfall. There are two main applications for rain sensors. The first is a water conservation device connected to an automatic irrigation system that causes the system to shut down in the event of rainfall.

  3. List of vehicle instruments - Wikipedia

    en.wikipedia.org/wiki/List_of_vehicle_instruments

    Speedometer; Tachometer; Odometer; Trip odometer; Oil pressure gauge; Coolant Temperature gauge; Battery/Charging system lamp; Low oil pressure lamp; Airbag lamp

  4. Air pollution measurement - Wikipedia

    en.wikipedia.org/wiki/Air_pollution_measurement

    The earliest devices used to measure pollution include rain gauges (in studies of acid rain), Ringelmann charts for measuring smoke, and simple soot and dust collectors known as deposit gauges. [1] Modern air pollution measurement is largely automated and carried out using many different devices and techniques.

  5. Precipitation types - Wikipedia

    en.wikipedia.org/wiki/Precipitation_types

    Precipitation is measured using a rain gauge, and more recently remote sensing techniques such as a weather radar. When classified according to the rate of precipitation, rain can be divided into categories. Light rain describes rainfall which falls at a rate of between a trace and 2.5 millimetres (0.098 in) per hour. Moderate rain describes ...

  6. Automated airport weather station - Wikipedia

    en.wikipedia.org/wiki/Automated_airport_weather...

    The original precipitation accumulation measuring device used for automated airport weather stations was the heated tipping bucket rain gauge. The upper portion of this device consists of a 1-foot (0.30 m) diameter collector with an open top.

  7. MAP sensor - Wikipedia

    en.wikipedia.org/wiki/MAP_sensor

    MAP sensors measure absolute pressure. Boost sensors or gauges measure the amount of pressure above a set absolute pressure. That set absolute pressure is usually 100 kPa. This is commonly referred to as gauge pressure. Boost pressure is relative to absolute pressure - as one increases or decreases, so does the other.

  8. Diffuser (automotive) - Wikipedia

    en.wikipedia.org/wiki/Diffuser_(automotive)

    Top: Lateral view; the red circles mark the front air dam/splitter and rear diffuser. Bottom: Rear. A diffuser, in an automotive context, is a shaped section of the car rear which improves the car's aerodynamic properties by enhancing the transition between the high-velocity airflow underneath the car and the much slower freestream airflow of the ambient atmosphere.

  9. Precipitation gauge - Wikipedia

    en.wikipedia.org/wiki/Precipitation_gauge

    The term "Precipitation gauge" may refer to: Disdrometer, an instrument used to measure the drop size distribution and velocity of falling hydrometeors; Rain gauge, also known as an udometer, a pluviometer, an ombrometer or a cup is a type of instrument used by meteorologists and hydrologists to gather and measure the amount of liquid precipitation over a set period of time

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