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Which device often is designed to have liquid enclosed in a glass tube?

User Theutz
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Thermometers have liquids encased in a glass tube. In the past, liquid mercury was used. However, due to health concerns and environmental issues associated with mercury, many new thermometers use a red-dyed ethanol that will evaporate much more quickly and is much less toxic than mercury.
User Rafaelcpalmeida
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