What is the normal human body temperature in Celsius?
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Normal human body temperature is a medically and scientifically important value. Option A (36°C) is incorrect — 36°C (96.8°F) is slightly below the normal range. While some individuals may have temperatures in the 36°C range (hypothermia threshold begins near 35°C), this is not the standard normal body temperature used in medical and exam contexts. Option B (37°C) is CORRECT — the normal human body temperature is 37°C = 98.6°F = 310 K. This is the internationally accepted standard normal core body temperature (oral measurement). It was established by German physician Carl Wunderlich in the 19th century from over a million measurements. The normal range is typically 36.1°C to 37.2°C, but 37°C is the standard value used in all competitive exams. Option C (38°C) is incorrect — 38°C (100.4°F) is the threshold for fever (pyrexia). A temperature of 38°C or above indicates a fever condition. Option D (39°C) is incorrect — 39°C (102.2°F) indicates a moderate to high fever. It is above the normal body temperature and indicates a significant infection or illness. For exams: Normal body temperature = 37°C = 98.6°F = 310 K. Fever begins at 38°C.
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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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