Question 1

What is normal body temperature?

Accepted Answer

37°C (98.6°F) is average. Normal range: 36.1-37.2°C (97-99°F). Fever: >38°C (100.4°F).

Question 2

Why do oral and forehead readings differ?

Accepted Answer

Core temperature varies by location. Oral: ~37°C. Forehead: lower. Rectal: higher. Methods vary.

Question 3

Why does -40 equal -40 in Fahrenheit and Celsius?

Accepted Answer

The two scales have different zero points and scale factors, but happen to intersect at -40. It's the only temperature where °F = °C.

Question 4

What's the coldest possible temperature?

Accepted Answer

Absolute zero (0 K = -273.15°C = -459.67°F) is the theoretical minimum. It's never been reached, though labs have gotten within billionths of a degree.

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