W Celsius
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No, it’s ultimately defined in joules.
every 1 K change of thermodynamic temperature corresponds to a change in the thermal energy, kBT, of exactly 1.380649×10−23 joules.
Yeah, of course that is the case now that most definitions have been updated to be tied to physical constants rather than observations that rely on specific conditions...
But the same wiki article you linked literally says otherwise. The Kelvin's magnitude was based on the magnitude of Celcius because of Charle's Law.
I.e. the volumes of gases under the ideal gas law scaled linearly with degrees celcius by about 1/273rd between 0-100C - which led to the prediction that the lowest possible temperature a gas could be was -273C (because that would be the point where it theoretically would have absolutely zero volume).
Which is a long-winded way of saying stop being a smartass. The guy you replied to was just as technically correct as you were, given they said 1k stemmed from 1C.
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lol you don’t think it’s accurate to a degree Fahrenheit? Why wouldn’t it be?
It's just not that fine tuned of an instrument. The furnace also runs on intervals so it's just going to naturally fluctuate a bit. Like with anything "it depends", but I doubt it's possible to keep the room within a tenth of a centigrade just with a consumer level thermostat. Maybe in a small room with resistive heating? I'd love to see actual measurements of this.
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Because it's mass produced consumer goods operating on a "below x temperature turn on heat/turn off AC" and "above y temperature turn off heat/turn on AC". Old ones are just bimetallic strips where you change the trigger position with a slider, and modern ones use commodity grade temperature sensors, and neither is guaranteed to be placed particularly far from the vent.
The sensor is typically on the thermostat. Not at the vents. You would typically place the sensor in a central location in the house. A high quality multi speed motor AC is designed to keep a decently consistent temperature which is a bit more complex than just turn on / turn off. If you’re dropping $15k to $30k on central AC, they aren’t going to cheap out on a poor quality temp sensor.
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Really my point is you can memorize new numbers when you look at the weather report.
When I go (went ) to the US it was not obvious to me looking at the weather in Fahrenheit what it would feel like.
Yeah, you just remember 0/20/40 °C close enough to 30/70/100 °F is freezing/good/heat stroke.
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The funnuest argument for farenheit that i keep seeing is: celsius is good for scientific things, but in everyday life, farenheit is better, because it tells you how it FEELS. 60F feels pleasant while 40 is too cold.
The delusion is real, even tge dumbest american can learn new numbers, i believe in you the same way you velive a pedo is gonna save you
Exactly, its just cope. Someone who grew up entirely on metric temperature will have exactly the same intuition. For example myself:
<0 = freezing
0-10 = Cold
11-17 = Warming up
18-24 = Comfortably warm
25-29 = Tropical
30-40 = Uncomfortably hot
>40 = Dangerously hotBesides which, all of this goes out the window once wind chill and other external effects that absolute temperature cannot account for come into play.
It's the usual American exceptionalism that causes them to throw a tantrum every time they're asked to conform to a worldwide standard. There's a reason most of the world uses metric measurements for most things in every day life, and its because it just works once you get used to it.
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But they didn’t say “stemmed”. They said “stemming”. But sure, they’re technically correct in a historical context. I wanted to be more precise about the current definition. Under that current definition, it’s actually degree Celsius that stems from Kelvin.
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I'm in Québec, -10 is chilly, 14 is shorts
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The cold/warm at the bottom doesn't make sense unless you're water.
Fahrenheit is like asking a person how it feels, Celsius is like asking water how it feels.
Also everyone loves metric until you have to ask for a third of something...
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Metric time
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As a European living in the US now for many years the temperature scale is the least of my annoyances. It's easy enough to memorize be ranges for what to wear. Fahrenheit is more granular, which is nice sometimes but really doesn't matter.
No, let's convert all the ridiculous weight/volume measures first. Having two kinds of ounces makes no sense. Measuring solids by volume (mostly) doesn't make sense. Having different units for different magnitudes doesn't make sense.
Fortunately things are often labeled in both metric and customary units so I can convert way easier.
Now if you'll excuse me I'm going to have my 12 fluid ounces of coffee and a 1/3 cup of oatmeal.
If they'd just standardized on one unit per measurement and apply si prefixes it's still an imperial unit but easier to work with. Say a quart for volume, and a yard for distance, because they're close to liter and meter. But I guess a kiloyard and a deciquart is taking it too far.
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1 mile is 5 tomAtoes (5280)
my kid
Edit: formatting
Another mnemonic, "ailing office" is 5280 in the major system.
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That does make sense when you need absolute precision like when doing abstract math. Otherwise you can just use whichever unit and number of significant digits you need and be precise to that amount. That's what you do with imperial/American customary units as well; a 5/32" screw isn't going to be manufactured to the precision of a Planck length; manufacturers specify their sizes to three significant digits of an inch.
Let's say you have a machining project and your tools are precise to 0.1 mm. So you plan things out at a precision of 0.1 mm. It doesn't matter that a distance is 17/38 cm exactly. It doesn't matter that it's 4.473684210526315789... mm. You can't set the tool to anything better than 4.5 mm anyway.
Also note that the metric system doesn't prevent you from using fractions. You're perfectly free to work with fractions where useful. That's just not how people talk about lengths because those fractions have no meaning outside your specific use case.
But that 5/32 screw has its precision built into the measurement. Sig figs and error ranges aren't required for fractional, because both are built into the denominator.
If your 5/32 measurement is super precise you can record it as 160/1024ths, because the denominator has "+/- 1/2048" built into the measurement.
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As a European living in the US now for many years the temperature scale is the least of my annoyances. It's easy enough to memorize be ranges for what to wear. Fahrenheit is more granular, which is nice sometimes but really doesn't matter.
No, let's convert all the ridiculous weight/volume measures first. Having two kinds of ounces makes no sense. Measuring solids by volume (mostly) doesn't make sense. Having different units for different magnitudes doesn't make sense.
Fortunately things are often labeled in both metric and customary units so I can convert way easier.
Now if you'll excuse me I'm going to have my 12 fluid ounces of coffee and a 1/3 cup of oatmeal.
It's funny because all of the imperial units are mathematically based on metric anyway.
I'm an American, so I started with imperial units, but I am making the very slow progression of converting to metric. I already use metric for work, and it's already the scientific standard here and has been since the 70s. It's just turbo annoying to try and get used to a new measuring system that I use reflexively especially when surrounded by imperial units. Makes it too easy to trip up and fall back.
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Sauna temperature is usually around 80-100°C, depending on your preference.
World Sauna Championship starting temperature was 110°C
Fascinating. And now I really wonder what "small things" the prizes were.
EDIT: Also fascinating how Kaukonen and Pusa duked it out for 9 years in the men's competition. -
As a European living in the US now for many years the temperature scale is the least of my annoyances. It's easy enough to memorize be ranges for what to wear. Fahrenheit is more granular, which is nice sometimes but really doesn't matter.
No, let's convert all the ridiculous weight/volume measures first. Having two kinds of ounces makes no sense. Measuring solids by volume (mostly) doesn't make sense. Having different units for different magnitudes doesn't make sense.
Fortunately things are often labeled in both metric and customary units so I can convert way easier.
Now if you'll excuse me I'm going to have my 12 fluid ounces of coffee and a 1/3 cup of oatmeal.
I very much prefer to cook/bake/prep in metric grams.
2c white flour, sifted.
1c brown sugar, packed.
1c room temperature water.
2tsp active dry yeast.
2tbsp vegetable oil.
1/2tsp baking powder.
2 egg yolks.
5 egg whites.
Pinch of cinnamon.Fuck you. Tell me how many grams that is. I don't need five different tools to measure out my ingredients. I need a wet bowl, a dry bowl, and a scale.
Also this isn't a real recipe I just started naming shit at random.
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The fraction allows you to communicate length and tolerance in a single number. A decimal implies precision to the last number, a measure with a fraction can show 1/8 as more granular than 1/16. 1/8 of a cm is less precise than a mm, but if you wrote 1.125 cm, you are now implying sub mm level precision.
This matters because the level needed in building generally doesn't line up to 1/10 measurements. For example if you had a brick wall and a row had 1 cm height differences between bricks in a row it would be extremely obvious and look terrible. A 1mm height difference would be impossible to notice, but is also overkill to get that level. Ideal is about 5/8 cm or 6.35 mm difference over 3 meters of wall. The fractional measure often ends up easier to work with in practice.
"The fraction allows you to communicate length and tolerance in a single number"
I don't see how that isn't true of decimals, too. 0.1 indicates a precision of 1 digit, 0.12 indicates a precision of 2, 0.120 indicates a precision of three.
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If I want to build something and I want it to be 23/48" ± 1/24" how would I write that? Because the way I understand it x/48" would imply a tolerance of ± 1/48".
If your tolerance is 1/24 your precision isn't fine enough enough to record 23/48.
23/48 has a built in tolerance of +/- 1/96, because outside of that range the measurement would read as either 22/48 or 24/48.
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What I'll defend, however, is fractional measurements when precision matters.
With decimal measurements, precision can't be nearly as granular. If your measurement is precise to one 1/8 of a unit, how do you represent that in decimal? 0.625 implies your measurement is precise to the nearest thousandth, but rounding it to 1 also isn't precise. 5/8, however, tells you the measurement AND the precision.
With fractional measurements, you can specify precision by changing the denominator to any number, whereas decimal is essentially fractional measurements, but with fixed denominator at powers of 10. For instance, a measurements of a half-unit with levels of precision between 0.1 and 0.10, fractional can be 6/12, 7/14, 8/16, 9/18, 10/20, 24/48, etc. Decimal can't specify that precision without essentially writing a sentance.
What's simpler to record? "24/48" or "0.5 +- 0.208333...."
0.625 implies your measurement is precise to the nearest thousandth
It does. If it were precise to less than that, you'd say 0.62 or 0.6 to indicate hundredths or tenths. Why would you say 0.625 if you're not precise to thousandths? You'd say 0.62500 if you wanted to indicate precision to hundred-thousandths.
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If they'd just standardized on one unit per measurement and apply si prefixes it's still an imperial unit but easier to work with. Say a quart for volume, and a yard for distance, because they're close to liter and meter. But I guess a kiloyard and a deciquart is taking it too far.
Yeah I think at that point it would be easier to just go metric.
Most Americans actually seem to be five with metric and probably would not mind it too much if we just switched. The objections are basically: 1) it's too expensive to switch now (okay), or 2) it's part of our identity (doubt). I swear to God everything is a culture war with some people.
More rational people, especially in STEM where it's already the standard, prefer it.
In general though, I would argue that Americans know metric better then Europeans know US customary, for what that's worth
It's mostly about what you're used to. Americans buy soda in liters, run 5km and do drugs by the gram. But we buy gasoline and milk in gallons and our recipes call for flour by volume. It's mostly inertia. At the end of the day you have to communicate with people around you so you use units they understand.
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I very much prefer to cook/bake/prep in metric grams.
2c white flour, sifted.
1c brown sugar, packed.
1c room temperature water.
2tsp active dry yeast.
2tbsp vegetable oil.
1/2tsp baking powder.
2 egg yolks.
5 egg whites.
Pinch of cinnamon.Fuck you. Tell me how many grams that is. I don't need five different tools to measure out my ingredients. I need a wet bowl, a dry bowl, and a scale.
Also this isn't a real recipe I just started naming shit at random.
I've had to translate recipes from Norwegian to American and this struggle is real. Never thought I'd need to look up material density tables for cooking.
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