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A Celsius Galilean thermometer in two degree gradations. A risen orange orb denotes 24 °C. A Galileo thermometer (or Galilean thermometer) is a thermometer made of a sealed glass cylinder containing a clear liquid and several glass vessels of varying density. The individual floats rise or fall in proportion to their respective density and the ...
Galileo thermometers are used to measure indoor air temperature, due to their limited measurement range. Such liquid crystal thermometers (which use thermochromic liquid crystals) are also used in mood rings and used to measure the temperature of water in fish tanks.
The Galileo Project, "The Thermometer" Benedict, Robert P., 1984. Chapter 1, "Early attempts to measure degrees of heat", in Fundamentals of Temperature, Pressure and Flow Measurement , 3rd ed, Wiley ISBN 0-471-89383-8 .
As a temperature indicator it used red wine. (Rømer scale), The temperature scale used for his thermometer had 0 representing the temperature of a salt and ice mixture (at about 259 s). 1709 — Daniel Gabriel Fahrenheit constructed alcohol thermometers which were reproducible (i.e. two would give the same temperature)
Galileo thermometer; Gas thermometer principle: relation between temperature and volume or pressure of a gas . Constant pressure gas thermometer; Constant volume gas thermometer; Liquid crystal thermometer; Liquid thermometer principle: relation between temperature and volume of a liquid (coefficient of thermal expansion). Alcohol thermometer
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The 17th century saw the development of the barometer and the Galileo thermometer while the 18th century saw the development of the thermometer with the Fahrenheit and Celsius scales. The 20th century developed new remote sensing tools, such as weather radars, weather satellites and wind profilers, which provide better sampling both regionally ...
The Galileo Thermometer actually measures pressure in the first instance, the pressure being caused by the change in ambient temperature. The AIR in the top of the sealed container is heated by the outside temperature and it expands, applying pressure to the surface of the liquid, which is incompressible.