Question 1

What is wind chill?

Accepted Answer

How cold it feels with wind. 0°C with 30 km/h wind feels like -9°C. Increases heat loss from skin.

Question 2

What is heat index?

Accepted Answer

How hot it feels with humidity. 32°C at 70% humidity feels like 41°C. Affects heat stroke risk.

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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