K = 273 + 5(F - 32)/9 is even worse
Why use kelvin when R = F - 459.67
“How hot is it, honey?”
“Not a lot, just 298.15 K”
Yeah but C makes more sense. 0-10 is cold but not freezing, 10-20 is cool, 20-30 is warm, 30-40 is hot, 40+ is “you’re gonna die of heat exposure! Get inside, what are you doing?!” increasing in urgency with the number. If it’s in the negatives, it’s the same as the 40+ except “cold exposure”.
It makes more sense in terms of our perception. But from a science perspective
KlevinKelvin makes more sense since you can’t go lower than 0 K and negative temperature doesn’t really make sense, since it’d mean something like negative energy.Who’s Klevin?
A lord.
A mistake plus Klevin gets you home by 7
Negative absolute temperature is a thing. Lasers exhibit negative temperatures when active, i.e. the lasing medium has a negative temperature expressed in Kelvin. Adding more energy doesn’t increase its entropy, it just turns into more laser light. Any such system with bounded entropy can have a negative thermodynamic temperature.
I had a suspicion there was going to be a response like this. Never heard of it but sounds very interesting.
I doubt I’ll properly understand it without a good YouTube video. I shall embark on a search
Yeah but from an every day perspective you’ve basically got 250 or so units there for no reason.
C++ is better ofc /s
Do you have a moment to talk about our lord and saviour, Rust?
NO SOLICITING!
I wouldn’t say it corresponds between negative and positive. -20 is already a lot more dangerous than 40.
Depends where you live, I guess. I don’t really consider -20 to be dangerous but I live in Canada so I know how to dress for cold weather.
Canada is dry. Humidity is the other Killing factor there.
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I’ve always thought it’s like: 0- is freezing, 10 is cold, 20 is ok, 30 is hot, 40+ is hell
Above 25 is hot, 30 is hell, 40+ is dead for me
On summer we normally hit 40+ (in some places even 45+) in Spain. I can confirm it’s hellish.
F has that too. Below 0, f it’s cold. Above 100, f it’s hot. 0-25 winter sports baby, 25-50 bleh it’s wet and nasty, 50-75 chefs kiss, 75-100 let’s hit the beach.
Also 0 is freezing so it can’t snow unless the temperature is below zero.
It very well can, it just won’t stick around.
And 100 is boiling, so cooking is easier
298.15 - 273,5 so its 24.65°C? I’d argue that is a lot. But i may just be heat sensitive
Edit: fixed typo Edit2: fixed another typo. I gotta start proof reading before sending
VERY generally speaking, 20s are warm, 30s are hot. Humidity changes this a lot. And yes, personal sensitivity to heat plays a role. I live in a dry climate, and I feel rather comfortable until we’re close to 30 ºC. I remember reading something like the ideal room temperature for humans was around 20-22 ºC.
For those using F, this is, more or less, the scale of C:
Below 0: freezing (0 ºC being the freezing point of water, duh!)
0 to 10: cold (don’t go out without a coat)
10s: cool (a sweatshirt or light coat may do)
20s: warm
30s: hot
40s: uncomfortably hot (stay in the shade and hydrate)
50s: you’re dead (or you wish you were. Unsafe for humans)Hot is still relative. Are you talking about soup, a cup of coffee/tea or outside temperature? People would probably answer differently in each instance.
Well… I said VERY generally speaking. And as I’m defining a gradient of temperatures (clearly it’s not the same 30 °C than 38 °C), I’m also defining a gradient of “hot” sensations, from feeling a bit of heat in your body, to feeling like an oven. That’s the thing with generalizations. I’m not trying to be precise here, just give a general idea to those that are not used to Celsius (I’ve seen the same being done with Farenheit and found it useful). Cheers.
Eh, as a weirdo who uses Celsius a lot but lives in Buffalo, NY…
-20s is cold. Coat, gloves, scarf, & hat. Long underwear. Not too much evaporation from the lake since it can freeze, so not much snow.
-10s is chilly. Coat, probably zip it up towards the lower end of the range. Decent chance of apocalyptic snow.
0-10s is cool. Wear a sweater.
10s is nice. Maybe consider long sleeves & pants if it gets a bit cooler.
20s is shorts & t-shirt weather.
30s is all AC, all the time. Uncomfortably hot not too far into the range.
40s is “the humidity is now so high the air is soup, filled with mosquitoes”.
Not a lot, to be honest.
Well into winter?!
Yes. It used to be around 27°C, but you know, climate change and stuff. The temperature in my hometown is around 35 °C.
That’s not a lot IMHO. It’s quite warm, but not hot.
I’m from the UK and part of the forgotten generation, so I was pretty much brought up on both systems. The “cheaper” way to do F from C is double it and add thirty. It works reasonable enough. Of course the reverse is minus thirty then half.
I’m definitely more native in deg C, but am fine with deg F too. Yes, I added deg to stop the coding jokes.
For easier mental C -> F conversion, take (2C)-(2C/10)+32 where C = temp in c.
16c × 2 = 32
32/10 = 3.2
32 - 3.2 = 28.8
28.8+32 = 60.8, which is exactly correct.
Or if you just want a rough estimate for weather, 2C+(22 to 32) gets you close enough with easier mental math
16x2+30 = 62, just 1 degree off.
37x2+30 = 104 is like 6 degrees off, though. The further from zero you are, the smaller the number you should add.
Rankine gang rise up
You’re not supposed to memorize the formulas, you’re supposed to draw it out on a graph from which the formula is derived.
It’s literally just a basic linear graph like from Algebra class. You can just trace your finger along the line and find the right temperature, no Egyptian hieroglyphics required.
