Physics
Temperature of distant luminous bodies can be determined by
Mercury thermometers
Gas thermometers
Pyrometers
Colour thermometers
Pyrometers
A pyrometer is a type of remote-sensing thermometer used to measure the temperature of a surface. It is a device that from a distance determines the temperature of a luminous surface from the spectrum of the thermal radiation it emits, a process known as pyrometry.
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Mach number is used in connection with the speed of
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