# How Can It Get Colder Than Zero?

The problem is people regularly think 20&#176F is twice as warm as 10&#176F! Everything we’re taught about math says it should be, but it’s not.

When I went to sleep last night it was 4&#176. We ended up bottoming out at around -4&#176. It was extremely cold, though the numbers are misleading or at least overstate the case.

Sit down. I hate to tell you this. There’s really little scientific significance to 0&#176 Fahrenheit! It was just a very cold temperature which could be produced reasonably consistently with the tools available 400 years ago. It is not where temperature stops!

From Wikipedia: According to an article Fahrenheit wrote in 1724, he based his scale on two reference points of temperature. The zero point is determined by placing the thermometer in brine: he used a mixture of ice, water, and ammonium chloride, a salt. This is a frigorific mixture which automatically stabilizes its temperature at 0 °F.

The second point, 100 degrees, was the level of the liquid in the thermometer when held in the mouth or under the armpit of his wife.

The problem is people regularly think 20&#176F is twice as warm as 10&#176F! Everything we’re taught about math says it should be, but it’s not.

There is an absolute point where the downward scale of temperature stops. It’s called “absolute zero” and it corresponds to -459.67&#176 Fahrenheit, -273.15&#176 Centigrade or 0&#176 Kelvin. At that temperature all molecular motion ceases!

Absolute zero doesn’t naturally exist though scientists have managed to approach it. They’ve never reached it. It’s possible they never will.

Last night we weren’t even close!

## 11 thoughts on “How Can It Get Colder Than Zero?”

1. There was recently a great show about Absolute Zero on PBS. Fascinating accounts of scientist attempting to reach it and what happens at that temperature. Did you see it?

2. Felix says:

At which temperature does hell freeze over? Are we there yet?

3. DorisC says:

Felix…if this keeps up I do believe hell will freeze over!!
I just keep thinking about spring!!!!!

4. John says:

Still pretty freakin’ cold, even for CT. This too shall pass. Its an excuse for a warm fire and a cuddle. Wait, wasn’t that yesterday’s discussion?

5. Edward Bowers (N1HSH) says:

-4, -10. Or 0. Still too damm cold for me.

10, 20, 32. with wind is also to cold.

57 days to spring.

6. Jim Murphy says:

Theresa, that was a great show…. I’ve watched it at least twice on youtube. Using one gas to get to the next one, ingenious!

7. Pamela says:

Great explanation. Also what I miss watching the weather with you. I am really enjoying reading your weather discussions and then some here and will continue monitoring the site from now on. Keep us updated on your plans too! 🙂

8. Heather says:

Geoff, You never stop teaching us some nugget of truth and it is done in such a simple way. I love it!! Please keep posting here. Also, wouldn’t mind if you did your own ‘storm warnings’ on here too. You really deserve your OWN weather channel. “Tune in to Geoff’s Weather Channel”. I sure would!!

9. Phyllis says:

Please keep teaching us on this site from wherever you are!

10. Barb says:

Geoff,
Thank you for this bit of information. Please==don’t ever stop teaching us. It keeps your mind working and we continue to learn
Barb

11. Laurie says:

“Frigorific?” Armpit of his WIFE? LMAO!