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What was used to fill thermometers before mercury?
- Brandy:The first thermometers, which were used in the 1600s, are nearly identical to those used today, except they were filled with brandy rather of mercury. The liquor was eventually replaced with mercury due to the material's wider range of liquid-state temperature. In a mercury or alcohol thermometer, the liquid expands as it is heated and contracts when it is cooled, so the length of the liquid column is longer or shorter depending on the temperature. Gabriel Daniel Fahrenheit, a Dutch scientist and inventor, constructed the first sealed-in-glass thermometer in 1714, using mercury instead of alcohol.
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