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How does a thermonmeter work and why heat is used to loosen a rusted nut on a bult?
Wiki User
∙ 8y ago
All analogue thermometers work because most (not all) solids, liquids and gases expand when heated and contract (up to a point) when cooled. The old Mercury filled ones and the ones with red dyed alcohol expand a liquid up a narrow tube with a vacuum at the top and a scale showing the temperature. The dial type use a spiral of expanding metal which gets longer and moves the needle. Digital thermometers use a junction of two differing metals which generates an electrical current which changes with temperature (this is called the Seebeck effect).
By heating the nut (and avoiding the bolt as much as possible) the metal expands, this increases the size of the hole in the middle, releasing pressure against the bolt and allowing you to turn the nut while hot. Wear heat proof gloves, eye protection and have extinguishing equipment and cold water to hand. The level of heat required is often described as "cherry red" and can cause some types of metal to permanently change their hardness... be very careful if you are working on safety critical things like brakes, replace all affected parts.
Wiki User
∙ 8y ago
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