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Handy temperature conversion scale.
(lemmy.world)
No degree sign for the my man Kelvin?
Really cold water, really hot water 😎
Jokes on you I’m a tardigrade
This is why I'm Fahrenheit gang all the way. I'm not running lab experiments daily, but I am going outside all the time. If you have to express the temperature with decimal precision for everyday use, you've lost.
Isn't Celsius smaller steps so without decimals, Celsius is more precise than Fahrenheit
You've got that backwards. One degree Celsius covers a wider range than one degree Fahrenheit, so Fahrenheit has more precision if you leave off decimals.
20 C is 68 F, and 21C is 69.8F. One degree C is nearly two degrees fahrenheit.
IT doesn't actually matter for common usage of either, but fahrenheit does have a smaller step between degrees.
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People who use Celsius don't typically casually refer to the temperature with a decimal place.
The comfortable range is more compressed, but just like you probably say 75 instead of 74.5, they say 24 instead of 23.889.
Fahrenheit does coincidentally line up nicely for subjective weather scales, so it's not offensive for that use, similar to how pint is a good cup size, but in general consistency is king and you're not loosing anything by compressing a scale, particularly when we basically already measure the temperature in five degree increments, and generally refer to in in units of ten.
As a metric person, I can confirm.
Indoor temperatures are basically 18-22 for most people most of the time.
15-25 covers the whole range of indoor temperatures that people with functioning heat or A/C would see.
For temperatures outside we commonly round to the nearest five:*
- -5 and below: very cold winter weather
- 0 cold winter weather
- 5 mild winter weather
- 10 autumn weather
- 15 spring weather
- 20 summer weather
- 25 beach weather
- 30 heatwave
- 35 and higher heatwave in the Sahara
The only thing I admire of the Fahrenheit scale is that it can round to the nearest 10 and still be a little bit more precise than Celsius with the nearest 5. And when discussing fever temperatures, Celsius needs half degrees and Fahrenheit does not.
But it's an absolutely awful scale for cooking.
Rounding Fahrenheit temperatures to 10 is less precise than rounding Celsius temperatures to 5.
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For cooking I think it's mostly a matter of what you're used to. Neither 145 or 63 are particularly "intuitive" numbers in my opinion, so as long as it's clear which you're using it doesn't really matter.
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And you can't go outside when you're too dense to read the temperature?
What? No one's using C to that precision outside the lab. It just depends on what you grew up with man. I know below 0 I need a winter jacket, ~10C chilly, ~20C is shorts weather, ~30C is hot, >40C is death. Perfectly practical everyday estimations.
For me the only advantage of F is you can say it's 69F out and bake things at 420F.
Also let me point out one nice feature here - the freezing point is 0. Bellow it you can expect snow instead of rain, ice on the road, sidewalk, plants are in danger, etc. A lot of things and situations in your life are affected by this simple fact that water freezes so it's nice that we have it at 0.
Fahrenheit has 32°F ...
Well, it usually doesn't actually start to freeze and snow at 32/0. It's usually got to be below freezing for a while before it gets icy, and it'll often snow above freezing and sleet below. It's usually more dangerous if it's above freezing because the layers of melting ice make the unmelted ice far more slick.
It's why for weather information, it really doesn't matter what scale you use so much as knowing where those bands are on the scale you use.
The peril is a gradient, so the actual number that matches freezing really doesn't matter.
At least that's my take as a person who lives somewhere where cold weather conditions are a frequent topic of conversation.
The temperature itself doesn't start to get perilous until you're in the negatives on the Fahrenheit scale, or -17C.
Exactly. My car warns me about freezing conditions starting at 37 F.
The most I use in temperature is setting the air conditioner at work from 68 to 70 or 72 depending how hard I'm working
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When pizzas call for 425°F, I purposely set the temp at 420° because of course
the food poisoning is so worth it
Uh, what? You do know you can cook pizzas at different temps to affect crust consistency, and that as long as meats are cooked to a proper internal temperature, bacteria is killed?
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I agree with most of that, but I have been in Phoenix, AZ in ~42°C. Sure it wasn't pleasant, but I'm not dead.
Edit: For extended periods, absolutely. For AC building hopping, survivable.
That is a slight exaggeration, but I know here in Australia if you went out in 42C with no sun protection then yeah, you're not having a good time and it is a risk to life.
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... You don't. But I find it funny when failheit rounds to the nearest 10s in conversation.
And believe it or not Celsius is much better for outside because it's actually zeroed to the actual fucking weather.
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Maybe someday a metric country will take 13th place for walking on the moon
That burn was out of this world
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What.
If you have to express the temperature with decimal precision for everyday use, you’ve lost.
I don't think it's necessary to do in Celsius though?
"Necessary" is a strong word, but it is, moreso than when using Fahrenheit.
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You don't need decimals for everyday measurements. No one can tell the difference between 60 and 62 degrees F. With Celsius 10 or 5 degree ranges is all you need to know for weather purposes, and it falls into much more logical ranges.
Below 0 = cold, limit time outside 0-10C = wear a coat 10-15 = wear a jacket 15-20 = comfortable 20-25 = shorts 25-30 = hot 30-40 = limit time outside 40+ = thank you global warming; don't live here.
No one can tell the difference between 60 and 62 degrees F.
This is true in the sense that someone can't walk into a room and say "it's 62F in here" accurately, but if you're in a room that's 60F and you raise the temperature to 62F you can definitely feel the difference.
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The Kelvin timeline is the worst
lol!
Three scientists arguing over the definition of zero
Celsius says “zero is the freezing point of water”
Fahrenheit says “no, zero is the freezing point of ammonium chloride”
Kelvin says “hold my beer”
Is that true about fahrenheit? I've never heard that before.
If I remember correctly, it's not the freezing point. Fahrenheit used a brine that included ammonium chloride to set 0 on his scale since it was the closest thing he could make in his lab that was a consistent temperature. The other end was body temperature, which he set at 96 if I'm remembering right since it's more easily divisible than 100. He was a little off on his body temperature measurements so it's considered a little higher than that now.
It's more chaotic than that.
He started with the Romer scale (brine freezes at zero, water 7.5, boils at 60, body temperature 22.5), which he tweaked to not need fractions for plain water freezing and body temperature by fudging some numbers and multiplying by four.
This made water freeze at 30 and human body temperature 90. He recalibrated it so that it was 32 and 96 so that there were 64 degrees between them, so he could draw the markings by dividing the interval between them in half six times.
He then saw that water boiled at about 212 on this scale, so he tweaked it again so that water froze at 32 and boiled at 212, since they're 180 degrees apart, which is desirable because it puts them on opposite sides of a temperature gauge.
Because of these tweaks, the original brine temperature is now about 4F, and body temperature is 98.6.
The tweaks make sense if you know that Fahrenheit was making and selling temperature gauges, so taking the Romer scale and marking every quarter degree gets you the first Fahrenheit scale.
Then he tweaked it to make it easier to produce, and then again to fit in the dial better.
So he fudged the science so the product would be easier/cheaper to make? Why does this feel like such a common story?
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It's debated. One source points to the lower end of the scale established as the freezing point of a brine made by dissolving ammonium chloride in water.
I have this theory that Americans suck at math because they insist on sticking with the imperial measurement system and so nothing makes mathematical sense - Americans intuitively just think in every day units qualitatively. Whereas the rest of the world uses metric, so base 10 math just comes naturally.
Source: I am a US STEM professor. Our students suck at math.
It may be that or it may be that our entire educational system has turned into shit through decades of low pay for teachers weeding out all the best people.
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this post was submitted on 28 Mar 2024
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