The scales of temperature are based on two fixed points which are_________________?
Correct answer: B. The temperature of melting ice and boiling water at atmospheric pressure
- A. The temperatures of water at 0? 100?C
- B. The temperature of melting ice and boiling water at atmospheric pressure
- C. The temperatures of ice cold and boiling water
- D. The temperatures of frozen and boiling mercury
Explanation
Temperature scales use two reproducible reference temperatures: the melting point of ice and the boiling point of water, both measured at standard atmospheric pressure. Option a gives numerical Celsius values but does not state the physical fixed points, while option c is less precise because “ice cold” is not a defined temperature.
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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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