Question 1

How do temperature scales differ?

Accepted Answer

Different zero points and degree sizes. Water freezes: 0°C = 32°F = 273.15K = 491.67°R.

Question 2

Why multiple temperature scales?

Accepted Answer

Historical development. Fahrenheit (1724) predates Celsius (1742). Kelvin (1848) for science.

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.

Temperature Unit Converter - Free Online Tool

Frequently Asked Questions

Explore Financial Toolset

Compound Interest Calculator

Mortgage Calculator

Debt Payoff Calculator

Retirement Calculator