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This question tests knowledge of all four temperature scales simultaneously. Option A (100°C, 212°F, 80°R, 373 K) is CORRECT — the boiling point of pure water at standard atmospheric pressure (1 atm) is: Celsius = 100°C (upper fixed point, 100 divisions above freezing), Fahrenheit = 212°F (upper fixed point, 180 divisions above 32°F), Reamur = 80°R (upper fixed point, 80 divisions above 0°R), Kelvin = 373.15 K ≈ 373 K (using K = C + 273 = 100 + 273 = 373). The image table clearly lists these values. Option B (100°C, 180°F, 80°R, 373 K) is incorrect — 180°F is the DIFFERENCE between boiling and freezing on the Fahrenheit scale (212-32=180), NOT the boiling point itself. The boiling point in Fahrenheit is 212°F. Option C (0°C, 32°F, 0°R, 273 K) is incorrect — these represent the FREEZING point of water across all scales, not the boiling point. Students frequently confuse the fixed points of different scales. Option D (100°C, 212°F, 100°R, 373 K) is incorrect — 100°R is wrong. The Reamur scale has only 80 divisions (not 100), so the boiling point is 80°R. The 100 belongs to Celsius (100 divisions), not Reamur. For exams: Boiling = 100°C = 212°F = 80°R = 373K; Freezing = 0°C = 32°F = 0°R = 273K.
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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.
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