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The freezing point of water is a fundamental fixed point used to define and calibrate all temperature scales. Option A (100°C, 212°F, 80°R, 373 K) is incorrect — these are the BOILING point values of water across all four scales, not the freezing point. Students must carefully distinguish between the two fixed points. Option B (37°C, 98.6°F, 0°R, 310 K) is incorrect — 37°C = 98.6°F = 310 K represents the normal human body temperature, not the freezing point of water. The 0°R in this option is coincidentally correct for Reamur but the rest are wrong. Option C (0°C, 32°F, 0°R, 273 K) is CORRECT — the freezing point of pure water at standard atmospheric pressure is: Celsius = 0°C (the lower fixed point of Celsius scale), Fahrenheit = 32°F (the lower fixed point of Fahrenheit scale), Reamur = 0°R (the lower fixed point of Reamur scale), Kelvin = 273.15 K ≈ 273 K (using K = C + 273 = 0 + 273 = 273). The image table shows Jal ka Ubalna (water boiling) and Jal ka Ubalna columns confirm these values. Option D (0°C, 32°F, 32°R, 273 K) is incorrect — 32°R is wrong. The Reamur scale's lower fixed point (freezing of water) is 0°R, not 32°R. The value 32 belongs to the Fahrenheit scale's freezing point.
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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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