We prefer mercury as a thermometric substance because______________?
Correct answer: D. All of above
- A. Over a wide range of temperature its expansion is uniform
- B. It does not stick to thermometer glass
- C. It opaque to light
- D. All of above
Explanation
Mercury is useful in thermometers because it expands nearly uniformly over a useful temperature range, does not wet or stick to glass, and is opaque, making its column easy to see. Therefore, all three properties support its use. A student may choose only a by remembering uniform expansion while missing the practical advantages of non-wetting and visibility.
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About Thermal Equilibrium and Heat
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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