Change of state - Matter changes state when it switches from one physical form to another. A change of state occurs when the atoms that make up the matter either gain or lose enough heat energy to alter their physical form.
Air in the bulb - Referred to as the thermometric medium, i.e. the medium whose property changes with temperature.
Mercury - The element mercury is liquid when it is in the temperature range of -38.9°C to 356.7°C. As a liquid, mercury expands as it gets warmer. Its expansion rate is linear and can be accurately calibrated.
Wheatstone Bridge Circuit - Invented by Charles Wheatstone for measuring resistances.
![Polling Station signage [Image: kagey b under CC-BY-NC-ND licence]](/openlearn/files/ole/ole_images/places/general-urban-scenes/polling-station-sign/polling station sign_0_0.jpg)
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