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0C is obviously freezing cold, and so is -40C. Now if someone in a 0C temp were to step in a -40C room, would it feel like an extreme difference? Now 0C to 40C is a tremendous difference (the latter temperature is a scorcher); But what about -40C and 0C? Because both are extremely cold.
Another question; At what temperature does a person's hair and eyebrows start to frost up or 'freeze'? According to the Titanic movie, at -2C your hair and eyebrows get frosted (despite the high salinity in the water).
I guess cold is perspective but from someone who lives in a cold climate in the winter.... 0c is not cold..... we can go 1-2 months below 0c in our winter in North Dakota/northern Minnesota. -40C however is entirely different and at that level for many hours....cars have trouble starting, plastic and rubber becomes very hard and breakable.....with or without wind.
At -40C:
Any part of your body not covered will in a few minutes or even sooner be hurting...untill it stops hurting, but thats when its getting dangerous and you might sustain permanent damage.
Plastic bags can be broken as if they were made of glass. Even metall get other properties and can be broken much more easily.
Take a cup of boiling water and throw it up in the air and it comes down as snow and ice.
Your car battery will not survive long after you have parked your car, so the car won't start.
Your Iphone might get in big trouble and be killed. And, your fingers will probably have big problems operating on a touch screen as they will be very dry in the cold and not be recorded by the screen. That is, if you dare to use bare fingers in -40C
Nothing of this will happen in 0C. Well, unless you have a really bad car battery...
Now, I've never experience anything close to -40C so I might be off, but isn't there a kernel of truth in the idea that each degree of temperature tends to matter more at moderate temperatures? Like for -30C versus -20C, for most everyday purposes you're either going to be inside or dressed in exceedingly warm clothing, so it's not a huge deal. However, the 20C is much more pleasant than 10C for a wide array of outdoor activities.
I've even noticed a big difference between 0C and -10C. I can maybe do without gloves at 0C, but not at -10C. Also, when it's -10C, my face feels like it's freezing, but at 0C it doesn't feel that bad. I've never experienced anything below -11C for long periods of time, so I can't speak for those temperatures.
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