Question 1

What temperature scales are used?

Accepted Answer

Celsius (most countries), Fahrenheit (US), Kelvin (science), Rankine (US engineering).

Question 2

Which temperature scale is best?

Accepted Answer

Celsius for everyday. Kelvin for science (no negatives). Fahrenheit more precise for weather.

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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