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The Fahrenheit scale was developed by Daniel Gabriel Fahrenheit in 1724 and is commonly used in the United States. Option A (0°F) is incorrect — 0°F on the Fahrenheit scale corresponds to the freezing point of a brine solution (a mixture of ice, water, and ammonium chloride), which Fahrenheit used as the lower reference point in his original scale. It does NOT represent the freezing point of pure water. Option B (32°F) is CORRECT — the freezing point of pure water on the Fahrenheit scale is 32°F. This is the lower fixed point of the Fahrenheit thermometer scale used for calibration. Pure water freezes at 32°F = 0°C = 273.15 K. Option C (212°F) is incorrect — 212°F is the upper fixed point (boiling point of pure water) on the Fahrenheit scale. The Fahrenheit scale has 180 equal divisions between 32°F (freezing) and 212°F (boiling). Option D (273°F) is incorrect — 273 is associated with the Kelvin scale (0°C = 273 K), not Fahrenheit. 273°F would be extremely hot and has no fixed-point significance on the Fahrenheit scale. Exam tip: Always remember — Fahrenheit freezing = 32°F; Celsius freezing = 0°C; Kelvin freezing = 273 K.
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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.
