If you think it's cold where you are check this out:
Mayo Airport - Past 24 Hour Conditions - Environment Canada (http://www.weatheroffice.gc.ca/trends_table/pages/yma_imperial_e.html)

Good grief! You'll be warmer if you sit in a fridge.

That's why they sell fridges to Eskimos.

I was too lazy to convert -44°F to Celsius, so looked at our thermometer instead... but it doesn't go that low....

Mayo is practically tropical compared with Oymyakon, Russia, currently reading -54C.

Omyakon weather (http://www.gismeteo.ru/city/daily/4021/)


Rising sharply to -44C on Sunday...heatwave! :ok:

I was too lazy to convert -44°F to Celsius, so looked at our thermometer instead... but it doesn't go that low....

It's easy to convert : -40F is -40C.

(so -44F is -40-(5/9*4) = -42C)

Free conversion here :-

p://www.onlineconversion.com/temperature.htm

Thanks peeps... I know the conversion, but with the thermometer just outside the window here it was faster....
BTW I can never remember the cross-over being at -40°, so I use 0°C=32°F as the starting point.

Actually, we use metric here but I thought it was more dramatic in Fareneheit.
Anyway, when it get's really cold you have to use one of these to get started:
"block heater" - Google Search (http://www.google.ca/images?q=%22block+heater%22&rls=com.microsoft:en-ca:IE-SearchBox&oe=UTF-8&rlz=1I7GGLL_en&redir_esc=&um=1&ie=UTF-8&source=univ&ei=6BT5TOuoHInCnAeOy6juCA&sa=X&oi=image_result_group&ct=title&resnum=4&ved=0CEkQsAQwAw&biw=1003&bih=567)
They either go inside the water jacket, or, in newer cars such as Toyotas, go into a cylindrical cavity on the block.

According to New scientist magazine, it's possible to have negative temperature. Not just below zero, below absolute zero.

I don't understand either.

Mayo Airport - Past 24 Hour Conditions - Environment Canada

Bloody hell. Except during the brief heat wave around 15:00 on Dec 2, they'd be freezing their nuts off up there.

We're used to it...... another round karbeep.....

http://cdn-www.airliners.net/aviation-photos/middle/1/7/2/0990271.jpg

Yer,but it's a kind of dry cold.:rolleyes:

At -44F if you spit, it's ice before it hits the ground. Makes a little cracking sound.

Christ! You wouldn't want to, er...

Actually it's the peeing that gets you.

Does the stream freeze up from the bottom or down from the top? (assuming you're not on a conveyor belt)

According to New Scientist magazine, it's possible to have negative temperature. Not just below zero, below absolute zero.
I don't understand either.Doc,
This is the 'New Scientist', remember?
So it's "New Science", much in the same category as "climate science".
If you don't like what you see, just make up the data.
Or move the goal posts.
Who was this Kelvin character anyway?

CJ

Does the stream freeze up from the bottom or down from the top? (assuming you're not on a conveyor belt)Interesting question...
I would expect if you expose the, err .... 'projecting orifice' for more than a few seconds, the stream will freeze before leaving the, err ... 'device'.

Wasn't pitot heating invented by a Canadian?

CJ

That pic from rt gives me an idea for a teenager's start-up airline in the UK.

Air Innit

This is the 'New Scientist', remember? However, they are correct for once: you can get to negative Kelvin temperatures, but not by going through absolute zero. It's all due to the strange way that temperature is defined; I forget the details myself, it was something we covered one afternoon in my Physics degree years ago.

As for temperatures, -40 isn't particularly unusual in this country :).

We haven't quite got there yet (it's coming!) but this was downtown Yellowknife last winter (ice fog is pretty standard in Dec/Jan/Feb):

http://inlinethumb19.webshots.com/46418/1029575691033698611S600x600Q85.jpg

LUXURY!

We 'ad it tough, right...

Every day we 'ad to get up 3 hours before we went to bed, clean the igloo -with us tongues, work 28 hours down the diamond mine and when we got home our father would murder us and dance up an' down on our graves singing glory allelujah...

An' if you try telling that to :mad: PPRuNers, they won't believe you!

Effin' baltic here tonight.

18.4c at 18.51

Any worse and I will have to look out a sweater :ok:

Who was this Kelvin character anyway?

He was a lord and he donated his balls to correct ship's compasses. :ok:

Think we might have to turn off the air con tonight. Bloody cold.:E

Ever try starting your car when it's really cold without a block heater?
If it actually starts, the engine sounds like:eek: When you drive off the tires feel like they are square until they warm up. The vehicle has all sorts of squeaks and unnatural sounds and if you force any control that doesn't want to move, like heater contols, you'll end up breaking them.

It's all but forgotten in an injected age. I just loved that big fireball that came out of the carb on occasion and burned my eyebrows off. This was the only substance in the entire shop (insecticides included) that would drop a wasp straight down after the hit.

Do I miss carburetors at -40? Hell no.

That happened to me too. Air cleaner removed, I held the automatic choke open with my finger... Whoosh, but I kept most of my hair!

In one year in Far Eastern Russia the temperature did not get above zero for eight months, day or night. Their growing season on the communes was only four months.

Tmb

But no place beats this: Arctic Team (http://www.herman-nelson.com/gallery_03.cfm) (Click on the first photo under "Arctic Team")

Thanks peeps... I know the conversion, but with the thermometer just outside the window here it was faster....
... or you could just click on the "Metric Units" link on the top left of the table. :8

... besides -Pah! "wind calm" - no wind chill in it at all! ;)

This is the 'New Scientist', remember?
So it's "New Science", much in the same category as "climate science".
If you don't like what you see, just make up the data.
Or move the goal posts.
Who was this Kelvin character anyway?

Actually, it is possible to go below 0K using NMR [magnetic spins] just not at equilibrium-so there's no violation of the second law...the physics is too involved or a posts on it but one must remember QM is based on statistics....:)

PA,
Would it be too much to ask for a link to, or a copy of, the NS article?
It's not quite my field, but I'd be interested.

CJ

CJ
well I'm not too much into general science publications...but here's a good source

J. Wisniak, Negative absolute temperatures,a novelty. J. of Chem. Educ, 518 (2000)


briefly though, although it is impossible to go below absolute zero in a finite number of steps the Boltzmann distribution shows that the population distribution at temperature 'T' =N+/N-=E^-eta/kT...where k=Boltzmann's constant if the population of the lower state exceeds the upper state, then the temperature will be numerically negative, however respecting the third law,...it is NOT an equilibrium state....:)

that's why I love when climate scientists teach me thermodynamics...:E

Got back into the UK yesterday after spending the past four days in the Siberian oil town of Kogalym.
Doing ground runs with a OAT of minus 36C, then adding the wind chill from the rotors is not an experience I want to ever have again. I have been to Russia many time to work with temperatures in the minus twenties, but this was something else. I spent nearly an hour in the shower trying to get comfortable again.

When I was working on my CPL rotary I got suckered into hooking up a sling load under a Bell 206 at about -25 C. It was probably the coldest experience of my life:eek:

File:Wind chill.png - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/File:Wind_chill.png)

You wanna live there, accept it. Just past midnight in Cape Town @<hidden> 24 degrees C. Eat your heart out !

I'll take Canada with its bloody cold weather anytime over any other country. It's at least, half civilised!

I slept on my boat on Sunday night. When I awoke on Monday morning I wasn't particularly surprised, on reaching up and touching it, to find that the condensation on the inside of the forepeak hatch had turned to ice.

What did surprise me was lowering my arm back down onto the top of the duvet to discover that this was crisply frozen too.

I'm guessing it was rather colder than Sunday's overnight forecast for the South Coast suggested it was going to be. :hmm: