Answer:
Thermometers consist of three basic elements: spirit-filled liquid, which response to changes in heat and cold; a glass tube to house the temperature-measuring liquid; and black ink to color in the engraved scale marks with readable numbers. For measuring temperature a sensitive thermometer is needed.
That said, prospective buyers should consider three major factors: requirements, specifications, and total costs, with accuracy, safety, and readability being essential parameters to compare.
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Decrease the volume of the bulb.Increase the diameter of the tube.Use mercury, which doesn't expand as much as alcohol. Mercury also has a much wider range between its melting and boiling points, so higher and lower temperatures can be measured.
