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  2. Pressure measurement - Wikipedia

    en.wikipedia.org/wiki/Pressure_measurement

    The technique is very slow and unsuited to continual monitoring, but is capable of good accuracy. Unlike other manometer gauges, the McLeod gauge reading is dependent on the composition of the gas, since the interpretation relies on the sample compressing as an ideal gas. Due to the compression process, the McLeod gauge completely ignores ...

  3. Knudsen absolute manometer - Wikipedia

    en.wikipedia.org/wiki/Knudsen_absolute_manometer

    A Knudsen manometer uses this temperature-effect to make a plate with dual temperatures rotate. It consists of a rotating plate, of which the centre of rotation is in the centre of the plate. Image the plate rotating, the parts that push the 'air' are the plate parts that are 'normal' temperature, the other sides are heated.

  4. Mercury pressure gauge - Wikipedia

    en.wikipedia.org/wiki/Mercury_pressure_gauge

    Further, the vacuum in the gauge eventually deteriorates due to slow diffusion of gases through the mercury, making the device inaccurate. [8] In 1938, Adolph Zimmerli (1886–1967) [9] invented a gauge that overcame the filling problems, at least for pressures below ambient pressure. [10] Zimmerli's gauge consists of three relatively wide columns.

  5. Pirani gauge - Wikipedia

    en.wikipedia.org/wiki/Pirani_gauge

    Keep the temperature of the sensor wire constant and measure the voltage as a function of pressure; Note that keeping the temperature constant implies that the end losses (4.) and the thermal radiation losses (3.) are constant. [3] The electrical resistance of a wire varies with its temperature, so the resistance indicates the temperature of wire.

  6. Sphygmomanometer - Wikipedia

    en.wikipedia.org/wiki/Sphygmomanometer

    A sphygmomanometer (/ ˌ s f ɪ ɡ m oʊ m ə ˈ n ɒ m ɪ t ə r / SFIG-moh-mə-NO-mi-tər), also known as a blood pressure monitor, or blood pressure gauge, is a device used to measure blood pressure, composed of an inflatable cuff to collapse and then release the artery under the cuff in a controlled manner, [1] and a mercury or aneroid manometer to measure the pressure.

  7. Gas thermometer - Wikipedia

    en.wikipedia.org/wiki/Gas_thermometer

    Charles's Law states that when the temperature of a gas increases, so does the volume. [2] Using Charles's Law, the temperature can be measured by knowing the volume of gas at a certain temperature by using the formula, written below. Translating it to the correct levels of the device that is holding the gas.

  8. Inch of water - Wikipedia

    en.wikipedia.org/wiki/Inch_of_water

    It is also given as inches of water gauge (iwg or in.w.g.), inches water column (inch wc, in. WC, " wc, etc. or just wc or WC), inAq, Aq, or inH 2 O. The units are conventionally used for measurement of certain pressure differentials such as small pressure differences across an orifice, or in a pipeline or shaft, [ 1 ] or before and after a ...

  9. Timeline of temperature and pressure measurement technology

    en.wikipedia.org/wiki/Timeline_of_temperature...

    1742 — Anders Celsius proposed a temperature scale in which 100 represented the temperature of melting ice and 0 represented the boiling point of water at 25 inches and 3 lines of barometric mercury height. [8] This corresponds to 751.16 mm, [9] so that on the present-day definition, this boiling point is 99.67 degrees Celsius. [10]

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