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The Reamur scale is a lesser-known temperature scale, but it appears in competitive exam content. Option A (0°R) is CORRECT — on the Reamur scale, the lower fixed point (freezing point of pure water) is 0°R. This is similar to the Celsius scale where 0°C is also the freezing point. The Reamur scale was proposed by René Antoine Ferchault de Réaumur in 1730. The scale has 80 equal divisions between the freezing point (0°R) and the boiling point (80°R) of water. Option B (32°R) is incorrect — 32 is the freezing point of water on the Fahrenheit scale, not the Reamur scale. Option C (80°R) is incorrect — 80°R is the upper fixed point (boiling point) of water on the Reamur scale, not the lower fixed point. The boiling point = 80°R corresponds to 100°C. Option D (273°R) is incorrect — 273 is associated with the Kelvin scale (0°C = 273 K), not the Reamur scale. There is no 273°R in standard thermometry. Exam tip: Reamur scale: 0°R (freezing) to 80°R (boiling) — 80 equal divisions.
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Heat is a form of energy that transfers between objects or systems due to a temperature difference, moving from a hotter body to a cooler one until thermal equilibrium is reached.
