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2. List of measuring instruments - Wikipedia

   en.wikipedia.org/wiki/List_of_measuring_instruments

   Pyrometers principle: temperature dependence of spectral intensity of light (Planck's law), i.e. the color of the light relates to the temperature of its source, range: from about −50 °C to +4000 °C, note: measurement of thermal radiation (instead of thermal conduction, or thermal convection) means: no physical contact becomes necessary in ...

3. Pirani gauge - Wikipedia

   en.wikipedia.org/wiki/Pirani_gauge

   The Pirani gauge is a robust thermal conductivity gauge used for the measurement of the pressures in vacuum systems. [1] It was invented in 1906 by Marcello Pirani. [2] Marcello Stefano Pirani was a German physicist working for Siemens & Halske which was involved in the vacuum lamp industry.

4. History of the railway track - Wikipedia

   en.wikipedia.org/wiki/History_of_the_railway_track

   The gauge is set by the positioning of the cast-in fixings, so it is not a simple task to re-gauge existing track; it also creates problems with spot replacement of sleepers. Many sleepers were made with the reduced track gauge but 1,435 mm (4 ft 8 + 1 ⁄ 2 in) standard gauge versions have also been manufactured in more recent times. [27]

5. Tape correction (surveying) - Wikipedia

   en.wikipedia.org/wiki/Tape_correction_(surveying)

   This means that the tape changes length by 1.16 mm per 10 m tape per 10 °C change from the standard temperature of the tape. For a 30 meter long tape with standard temperature of 20 °C used at 40 °C, the change in length is 7 mm over the length of the tape.

6. Barometer - Wikipedia

   en.wikipedia.org/wiki/Barometer

   The density of mercury will change with increase or decrease in temperature, so a reading must be adjusted for the temperature of the instrument. For this purpose a mercury thermometer is usually mounted on the instrument. Temperature compensation of an aneroid barometer is accomplished by including a bi-metal element in the mechanical linkages.

7. Standard temperature and pressure - Wikipedia

   en.wikipedia.org/wiki/Standard_temperature_and...

   At standard mean sea level it specifies a temperature of 15 °C (59 °F), pressure of 101,325 pascals (14.6959 psi) (1 atm), and a density of 1.2250 kilograms per cubic meter (0.07647 lb/cu ft). It also specifies a temperature lapse rate of −6.5 °C (−11.7 °F) per km (approximately −2 °C (−3.6 °F) per 1,000 ft).

8. Diving cylinder - Wikipedia

   en.wikipedia.org/wiki/Diving_cylinder

   Typical submersible pressure gauge Gas pressure in diving cylinders is measured in both United States customary units psi (pounds per square inch) and metric bar, where 1 bar equals 100 kPa, 0.1 MPa or about 14.5 psi. The face of this US-made cylinder pressure gauge is calibrated in pounds per square inch in red and kilopascals in black.

9. Depth gauge - Wikipedia

   en.wikipedia.org/wiki/Depth_gauge

   As the gauge only measures water pressure, there is an inherent inaccuracy in the depth displayed by gauges that are used in both fresh water and seawater due to the difference in the densities of fresh water and seawater due to salinity and temperature variations. A depth gauge that measures the pressure of air bubbling out of an open ended ...