A mercury-in-glass thermometer is a type of thermometer that uses mercury as the thermometric fluid contained within a glass tube. This design has been historically common for measuring temperature due to several favorable properties of mercury: 1. **Thermal Expansion**: Mercury expands and contracts uniformly with temperature changes, allowing for accurate and consistent readings. 2. **Visible Scale**: The glass tube is typically graduated with a scale that allows users to read the temperature easily.
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