<P> The alcohol thermometer or spirit 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 less toxic and will evaporate quickly . The ethanol version is the most widely used due to the low cost and relatively low hazard posed by the liquid in case of breakage . </P> <P> An organic liquid is contained in a glass bulb which is connected to a capillary of the same glass and the end is sealed with an expansion bulb . The space above the liquid is a mixture of nitrogen and the vapor of the liquid . For the working temperature range, the meniscus or interface between the liquid is within the capillary . 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 . </P>

What is the difference between alcohol and mercury thermometer
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