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LIDAR speed gun; Radar speed gun, a Doppler radar device, using the Doppler effect for indirect measurement of velocity. Speedometer; Tachometer (speed of rotation) Tachymeter; Variometer (rate of climb or descent) Velocimetry (measurement of fluid velocity) For the ranges of speed-values see: Orders of magnitude (speed)
A thermometer has two important elements: (1) a temperature sensor (e.g. the bulb of a mercury-in-glass thermometer or the pyrometric sensor in an infrared thermometer) in which some change occurs with a change in temperature; and (2) some means of converting this change into a numerical value (e.g. the visible scale that is marked on a mercury ...
An infrared thermometer is a thermometer which infers temperature from a portion of the thermal radiation sometimes called black-body radiation emitted by the object being measured. They are sometimes called laser thermometers as a laser is used to help aim the thermometer, or non-contact thermometers or temperature guns , to describe the ...
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Such thermometers are usually calibrated so that one can read the temperature simply by observing the level of the fluid in the thermometer. Another type of thermometer that is not really used much in practice, but is important from a theoretical standpoint, is the gas thermometer. Other important devices for measuring temperature include:
Some manufacturers use galinstan, a liquid alloy of gallium, indium, and tin, as a replacement for mercury. The typical "fever thermometer" contains between 0.5 and 3 g (0.28 and 1.69 drachms) of elemental mercury. [7] [8] Swallowing this amount of mercury would pose little danger but the inhaling of the vapour could lead to health problems. [9]
Thermal weapon sights are often used by hunters to aid in the detection of game, such as feral hogs, coyotes, or rodents such as rats. The sight's ability to see unaided even in complete darkness allows the hunter to be undetected and aware of potential prey, facilitating a quick and precise takedown. [3]
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