An instrument that measures the amount of expansion in a material, especially when heated.
Compound word: expanso- (from Latin 'expansus', expanded) combined with -meter (from Greek 'metron', measure). This is a technical term from physics developed in the 19th century.
An expansometer is essentially a physicist's thermometer's cousin—while a thermometer measures temperature, an expansometer actually measures the physical expansion happening as a result. This tool helped scientists understand that heat causes materials to expand at predictable, measurable rates.
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