galileo thermometer

Alcohol thermometer
From Wikipedia, the free encyclopedia
Alcohol thermometer
The alcohol thermometer is an alternative to the mercury-in-glass thermometer and has similar functions. Unlike the mercury-in-glass thermometer, the contents of an alcohol thermometer are toxic and will evaporate away fairly quickly. The ethanol version is the most widely used because of the low cost and relatively low hazard posed by the liquid in the event of breakage.
An organic liquid is contained in a glass bulb that is connected to a capillary of the same glass and the end is sealed with an expansion bulb. The space above the liquid is the vapor of the liquid and also a mixture of nitrogen. Within the capillary, interface or the meniscus between the liquid is for the working temperature range. With increasing temperature, the volume of liquid expands and the meniscus moves up the capillary. The position of the meniscus shows the temperature against an inscribed scale.
One half of the glass is usually enamelled white or yellow to give a background for reading the scale.
The boiling point of the liquid sets the range of usefulness of the thermometer. In case of the ethanol-filled thermometer the upper limit for measurement is 78 °C (172 °F), making it useful for measuring day and night-time temperatures and to measure body temperature, although not for anything much hotter than these.
Ethanol freezes at −114.9 °C (−174.82 °F).
Liquid crystal thermometer
From Wikipedia, the free encyclopedia

Liquid Crystal Forehead Thermometer
Temperature changes can affect the colour of a liquid crystal, which makes them useful for temperature measurement. Disposable liquid crystal thermometers have been developed for medical use and home. For example in the event the thermometer is black and it is put onto someone else’s forehead it’ll change colour depending on the temperature of the person.
There are two stages in the liquid crystals:
The nematic stage that is hot is the closest to the liquid phase where the molecules are freely moving around and partly ordered.
The cold smectic stage is closest to a solid phase where the molecules align themselves into wound chiral matrixes.
Liquid crystal thermometers portray temperatures as colors and may be used to follow temperature changes caused by heat flow. They could be used to observe that heat flows by conduction, convection, and radiation.
In medical applications, liquid crystal thermometers might be used by placing against the forehead to read body temperature. These are safer than a mercury-in-glass thermometer, and may be advantageous in certain patients, however do not always give an exact result,except the analytic liquid crystal thermometer which show the exact temperature between 35.5 to 40.5 Celsius.
Liquid crystal thermometers are also commonly used in aquariums[2] in homebrewing,[3] and in mood rings.
The Liquid crystal thermometer was invented by Bob Parker in California, one of a lot of the inventor’s thermochromic applications patented in the 1970s.

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By | 2017-06-24T12:14:40+00:00 20. 6. 2017|Thermometers|Comments Off on Galileo thermometer

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