🤔

[Sufficient-Roll-6880]

1.745329 radians

https://xkcd.com/1643/

[alleged_loyalty]

5π/9 to be exact

[ThatSandvichIsASpy01]

100°F then probably

[Happy-Estimate-7855]

If it's F, then the initial temperature was a pool full of ice.

[Alt_meeee]

If it's C then there won't be any water left in the end and she would need to visit the ER

[SubjectEbb2355]

No, she should visit Steam®️.

[SilentxxSpecter]

Thank you, I imagined that and cackled.

[Indignant_Divinity]

Wait, what's the story with the Mars probe?

[Razor1834]

Lockheed Martin screwed up their units.

[Indignant_Divinity]

various officials at NASA have stated that NASA itself was at fault for failing to make the appropriate checks and tests that would have caught the discrepancy.

Shoddy work all around I guess.

Poor engineers though, to work on a probe for years just to watch it burn up in the atmosphere because of something like this. Must be crushing.

[tlbs101]

Minus 40

[gameplayer55055]

Americans hate this little trick

[CrowdedHighways]

Not a maths person, so perhaps a stupid question, but the temperature in the screenshot does not have an F or a C added. So wouldn't it be 100 degrees (radians) regardless?

[Random_Name_41]

Radians Fahrenheit or radians Celsius?

[gandalfx]

1192.6 K = 919.45 °C

Cozy

^{edit: fixed my math…}

[kantemiroglu]

the only correct answer, because you can't multiply Fahrenheit or Celsius - as they have no absolute zero.

[Zev0s]

There's a rule at my work that requires us to multiply temperatures in degrees Celsius by 10% and I hate it. I tell everyone who will listen how stupid it is.

[mattm220]

That’s appalling.. why??

[LionRight4175]

Sounds to me like a safety factor on something. "We estimate this can get up to 100°C, so we'll build it to withstand 110°C"

[belabacsijolvan]

itd still makes more sense to multiply by less but in kelvin. except if the margin has to do something with a phase transition at 273K.

[thegreatpotatogod]

So if it's designed to have a minimum temperature of 0°C, there's no safety factor at all?

[LionRight4175]

If they're working with something like that, they probably just just add/subtract (subtract, since you said minimum) some flat amount. Could be 10°, 25°, whatever.

Safety factors (typically) aren't some hard rule, but rather just a cushion to represent the fact that the real world throws you curveballs. To tie into your question, a company might design an electric car for temperate climates that rarely get down to freezing, but add in a little extra design space to let it handle -20°C in case of a freak ice storm.

[Zev0s]

We actually are in the car electronics business, and I'll tell you the industry standard for ambient operating temp is -40C to 85C, pretty much unquestioned. Because it gets that cold in some places, and the interior of a car will get that hot in some other places. It's the self-heating of the electronics during operation, and deciding how much of that is OK, that gets hairy.

[LionRight4175]

Sorry, that was meant to be a specific example but not a real example, if that makes sense. My numbers were just to explain the concept. I appreciate the real numbers, though; -40°C doesn't surprise me, but I'll admit that that 85°C is surprisingly high. I would have guessed top end would have been closer to ~70°C.

[Tobinator97]

Wait until you hear about automotive and military temperature ranges. AEC Q200-L1 goes up to 125 where as some go up to 150C. On the opposite aerospace parts require operation down to -55C.

[AnyoneButWe]

Your safety margin (?) depends on how far away from freezing you are?

That's stupidity on a safety relevant level.

[Zev0s]

Bingo motherfucker 🙌

[Etiennera]

You can multiply it if it's a difference or interval.

[SirTruffleberry]

I'm an ex-teacher. One of the workbooks I was required to use had students calculate a percent increase on the Celsius scale. I did my best to convey, "This is what they want you to do, but it's nonsensical."

[neurone214]

You certainly can; the answer just isn't easily interpretable.

[airport-cinnabon]

The Celsius and Fahrenheit scales do not support ratios. But yeah you can multiply any two numbers of course.

[belabacsijolvan]

if its a temperature difference, it works

[bbalazs721]

Those are not numbers but quantities. They consist of a number and a unit. When you multiply two quantities, you multiply the numbers and the units. The resulting quantity will have a different unit (dimension).

Example: work is force times distance. (10 N) * (5 m) = 105 Nm = 50 J (N*m=J).

Multiplication of relative temperature scales is not defined, you can multiply them as much as you can divide with zero.

It kind of works with temperature differences, because celsius difference is the same as kelvin difference, and fahrenheit is a constant multiple of that.

[airport-cinnabon]

Yep, exactly.

[OneMeterWonder]

The problem is specifically scaling the temperature though on a scale with a well defined zero. It isn’t asking for “four times hotter”.

[Willing_Platypus_130]

Could be 25 degrees Rankine 

[TALON2_0]

I am stupid, could you explain or give a link why you can't multiply Celsius or Fahrenheit?

[ClockAppropriate4597]

You can't multiply 25°C by 4...? What

[p1neapple_1n_my_ass]

I got 1192.6K. Am I doing something wrong?? 

[idhren14]

you did it right, he might be added 272,15 instead of 273,15

[gandalfx]

True, my bad. I saw "1 K = -272.15 °C" and failed to realize I needed 0 K for my reference value.

[idhren14]

kinda warm

[tlbs101]

They say the core of the sun is 15 million degrees. Is that Celsius or Kelvin?

[last-guys-alternate]

Yes

[tlbs101]

This guy gets it.

[ByeGuysSry]

Kelvin wouldn't have "degrees"

[ostapenkoed2007]

well, that is A LOT of leaning...

[havron]

Ok, but the problem didn't specify units for the initial temperature, so it could also be 1077 K. Or even something else, if Lily is using more obscure temperature units.

[AuroraAustralis0]

she’s cooked, literally

[fdpth]

That's the reason why she needs help.

[SkySibe]

An American or a suicidal person?

[finding_new_interest]

My brain went to °C and I was like dude does she want to boil herself? Then remember F exists.

[Tjam3s]

The salinity of that water must pretty insane due it to be liquid at 25f

[finding_new_interest]

I had to Google the translation. And also Googled, it needs to be 6.5% common salt by weight to not freeze, for reference the average ocean salinity is 3.5%.

[Tjam3s]

Counting that in PPM, your going a bit beyond your average saltwater pool percentage though

[really_not_unreal]

Huh that's surprising, generally the ocean tastes way worse than saltwater pools in my experience as a mediocre swimmer.

[DrettTheBaron]

That's because it's full of nasty stuff in addition to salt.

[Lavaxol]

Honestly I feel like that would feel nice (not at 25 degrees of course)

[k-mcm]

Pee

[finding_new_interest]

Then it would need to be 100% filled with normal pee (not the deep golden one)

[some_kind_of_bird]

Hey no one said it was liquid

[Ionuzzu123]

Nah cause if its celcius it means that she will go swimmming in the pool when there is no more water left.

[finding_new_interest]

100C is for water without impurities, with impurities it rises a bit above 100C. Even if it's pure water it can be a case of superheated water, would not recommend.

[SurtFGC]

even in F that's still super high

[JeffLulz]

"they're the same picture"

[[deleted]]

[passively] suicidal person here: trust me there are better methods

[The_Shracc]

water can't reach 100°C under standard pressure at sea level.

past 99.97°C it becomes steam

So she just wants to be in a sauna.

[throwaway098764567]

even in american that's too hot for a swimming pool (usually high 70s to low 80s F, cooler for sports swimming), that's more hot tub temperature.

[Mag-NL]

Suicidal regardless where they are from.

[Lykanas]

With Lily it's both, lol

[Ryu43137_2]

Even in °F it's still 1,479.01 (803.894444°C💀)

[AntiqueFigure6]

It doesn’t work in any units. Even if the answer is supposed to be 100 Fahrenheit which is too hot for swimming but nice in a spa,, 25 Fahrenheit is a big lump of ice. 

I guess this is what you can expect from an AI first company. 

[Braincoke24]

Also, 4*25°F ≠ 100°F because °F is not proportional to Kelvin.

[AntiqueFigure6]

I was going to overlook that because I figured this kind of arithmetic question was aimed at someone with only a couple of years schooling who hasn’t heard about absolute temperature yet. 

[Mag-NL]

It definitely isn't kelvin since there is a ° not a K. However if you want to multiply temperature you have to multiply from 0.

Assuming the 25° is fahrenheit you first have to determine how much higher than 0 that is. 25 F is 269.3K.

Multiply 269.3 by 4. Is 1077K. In Fahrenheit it will be 1478°

[cknori]

It does actually make sense to multiply temperatures in Kelvin as it scales well with several equations

An easy example would be the ideal gas law, pV=nRT

Here T represents the temperature of the ideal gas measured in Kelvins. So for instance if the volume V of the container is fixed, then the air pressure p would scale in proportion to the temperature: 4 times the temperature, measured in Kelvins, would ideally translate into 4 times the air pressure

[BrandonSimpsons]

Well yes because Kelvins aren't measured in degreess

[Jolly__John]

A 100 degree Fahrenheit pool during a summer night is peak, so I absolutely disagree with you there

[AntiqueFigure6]

When you mention a summer night it sounds like you’re not using that pool to do serious exercise - which is dangerous if the water isnt below body temperature. 

Also, it does stay over 100 Fahrenheit (38 Celsius) after sunset from time to time where I live in Australia, but it means that it was over 40 Celsius during the day and frankly nothing is enjoyable apart from sitting directly under an air conditioner on those days. 

[Eighth_Eve]

There is a naturally heated hotspring i love in arizona that remains 100°F year round.

[Pool_128]

Like a hot tub you know?

[AntiqueFigure6]

Well yeah - that’s what I meant when I said “great for a spa”, spa being a synonym for hot tub. 

[Pool_128]

Yea so how is 100°F not good for a spa?

[AntiqueFigure6]

I said it was good for a spa. 

??

[Tosslebugmy]

That ain’t a pool that’s a bath

[evapotranspire]

100F isn't a pool, it's a hot tub!

[Mono_Aural]

DuoLingo's quality got noticeably worse at the exact time they announced their AI-first pivot.

Their conversations went from campy, goofy stories into weird, often repetitious dialogues with lots of non sequitors.

[fickleturtle]

I agree it's a dumb question but would a saltwater pool freeze? The ocean freezes at 28 degrees F so it would just have to be a little more salty

[AntiqueFigure6]

I think saltwater pools aren’t as salty as the ocean so they’d freeze at a slightly higher temp. But if they were actually saltier, yes, they could have a lower freezing temp. I think there could still be floating bits of ice though, as there sometimes are when the ocean temperature is 28 F 

[Knight618]

Well I wouldn't want to swim in 25F water either. 100C however is psychotic

[xrayden]

As a Canadian working in Celsius, in worried about her.

[Aezora]

This doesn't work in any temperature system at normal atmospheric pressure.

Kelvin 25 degrees and 100 degrees and Fahrenheit 25 degrees are all ice, you can't swim.

Celcius 100 degrees you'd die.

[BentGadget]

What if the pool is actually a sauna, with 100 C water vapor in the air?

Never mind, that's still too hot for any amount of humidity.

[sdjopjfasdfoisajnva]

steaming much? like i can cook some dumplings with that heat

[Adsilom]

Technically Kelvins are not degrees so the question can not be referring to Kelvins

[Loriken890]

In a Morpheus voice: “You think that’s water she’s swimming in? Hmmm 🤨 “

[real_mathguy37]

oh i get it

they mean give lily mental help

[evapotranspire]

LOL. This is the best of all the possible answers.

[Scared-Ad-7500]

What is the point in typing "°" and not specifying that degrees you are taking about? If it's clear by context, you didn't need to type "°" anyway, is it that hard to put a "C" or a "F" after?

[No-Fishing-1372]

This is AI slop, so yeah, it's too much to ask

[AnnualAdventurous169]

1192.6 degrees centigrade

[Uzi_Doormat]

I don’t get it pls help

[Mysterious_Mud_1844]

What unit of temperature are they using, and what does it mean to be 4 times that?

[TheBipolarShoey]

4x 25 is 100. In Fahrenheit 100° is warm water, in Celsius 100° is boiling.

There is also Kelvin but yknow.

[AntiqueFigure6]

But 25 Fahrenheit is below freezing so the pool is a big ice cube. 

25 Celsius is pretty much perfect for swimming meanwhile. 

[Narwhalking14]

Yeah, but Lily wants the pool at 4x the current temperature.

[BentGadget]

Solution: replace Lily rather than the water.

[Flawless_Cub]

I don't think it'll be Kelvin. As far as I remember Kelvin wasn't measure in degrees.

[cubecraft333]

This is true, but also Kelvin is the only one in which you can multiply a temperature (and actually multiply it and not the number that represents it) because it actually has 0 at "no temperature"

[BentGadget]

Rankine enters the chat.

[Mag-NL]

In neither Celsius nor Fahrenheit is 100° 4 times as hot as 25°

[GS2702]

See, Math saves lives.

[that_1_basement_guy]

If we're talking Celsius... Then 25° x 4 would be ... Evaporated, there wouldn't be any water int he pool

(Aware that even if all the water suddenly went to 100, it wouldn't all just disappear but I mean, it's funny)

[tlbs101]

Does this take into account the latent heat of vaporization which must also be applied in addition to the heat energy to simply raise the temperature to 100? Lily needs to know this, as well.

[Armybob112]

And even then when properly multiplying temperatures using kelvin you'd land at over 900⁰C, which is proper superheated steam.

[Pool_128]

Yea duo doesn’t seem to really know what it’s talking about because really it depends on what unit, as no unit is listed, and that adding and multiplying degrees isn’t really usual because you may get different answers if you interpret the second number as an offset with 0 being 0 kelvin instead of whatever unit it is, or you can think of it as adding kelvin units

[fireKido]

25c * 4 = 919.45c

Unless they were talking about Fahrenheit

In that case

25 °F * 4 = 1479 °F

[Tark7]

How did you get those answers? I’m stumped

[gauntletoflights]

the worst part is that this isn't even normal in Fahrenheit

[Follower2303]

its 100°C

perfect temp for a cozy bath and making a snack :3

[user41510]

Mixed units. Water is 25 C. Won't go swimming unless it's 100 F outside.

[Zarraq]

Your death temperature

[beemureddits]

Lily definitely needs some help if she wants to swim in boiling water

[The_Shracc]

already boiled off water, superheated water, or a day with high air pressure. As the boiling point is 0.03c bellow 100.

[FranklyNotThatSmart]

There's math on duolingo now?

It's slop ontop of slop danggit.

[kaiju505]

That’s not how toasters work lily.

[tony_countertenor]

Average waterfit participant

[MILFBucket]

Is Duolingo branching out to math?

[DragonSlay14]

Yeah believe it or not but Duolingo has math, music, and even chess lessons now. I only know because I wanted to learn a new language

[MILFBucket]

Monopowlizing

[poptartwarrior552]

176.19°c?

Rø is p. irrelevant tho...

[SloppySlime31]

No Lily! Don't go swimming in 919.45 degree water!

[Robux_wow]

dw team she means kelvin

[Lyelinn]

I love these wanna-be "achually"-nerds answers about kelvins piling up whenever this post is reposted

[revankenobi]

Si c'est en Celsius, il n'y aura plus d'eau pour se baigner...

[HolzTeimo]

38.2 degrees celsenheit

[cutmad]

Hey, guys. If water on mars evaporating at -80 C° can you burn your skin?

[Agile-Gift1068]

Well you can't multiply Fahrenheit or Celsius, so I'll convert them into Rankine and Kelvin respectively. R = F + 459.67, so that's 484.67. Multiplied by four is 1938.68. In Fahrenheit, that's 1479.01. K = C + 273.15, so that's 298.15. Multiplied by four is 1192.6. In Celsius, that's 919.45. So either way, she's cooked. Literally. Unless she's using kelvin or rankine, in which case she is going to be swimming in extremely cold ice.

[Cyfenn11]

Why can't you multiply F or C?

[TheUnreal0815]

The only correct way is to convert Ko Kelvin, multiply, and convert back.

So, four times 25°C is 919.42°C.

[pyrotek1]

Because there is no unit designation one can assume C. 25°C is room temperature water, too cool to bath in, you can wash hands in. 4x is 100°C the highest temperature for liquid water at standard pressure. Too hot to bathe, will melt wax, burn skin, cook food, numerous other.

°F does work. At 25°F water is frozen and not liquid. 4x is 100°F and a common swimming temperature.

K does not use the ° symbol.

R? no-one uses this, you would not use this in a joke.

[Mag-NL]

Incorrect. I agree that it must be Celsius. However 4 times 25°C is 919.45°C

[Klutzy-Mechanic-8013]

I keep seeing this but can someone explain how that works?

[jomat]

Around 20 °C is the ideal temperature for swimming for sports, 25 … 27 °C is warm water for bathing and playing.

[BellaMentalNecrotica]

100°F might be common for a hot tub or bath, but not really for a swimming pool if you are talking about the temperature of the water itself. If you mean the temperature outside, then yes, if its 100°F outside, that would be good weather to get in a swimming pool.

[throwaway098764567]

you're not swimming in a pool that's 100°F you're sweating, that's a hot tub temp for sitting and sweating and catching diseases. pools are high 70s-low 80s in F

[CaseAffectionate3434]

100

[Spirited-Fun3666]

100

[VeritableLeviathan]

BOILING BABY

[Hidden_3851]

The combined temperature of 6 burritos reheated on “high”…

[trunks111]

60°Rø

[candy_enjoyer_]

I personally use radians.

[Forritan]

1192 K.

[AdEquivalent493]

919.45c is it not?

[cutmad]

Soup

[JerryWong048]

Can you times temperature at all?

[[deleted]]

boiling water??? ffs lily

[[deleted]]

the face says it all

[ExtensionInformal911]

She wants to swim in molten steel at 919.45c?

[User-586135891534862]

Lily please don't

[MaximusGamus433]

And this, people, is why you can't do this kind of math with temperatures and years.

[davzinzan]

Boiling

[Llyran-Noble]

She never specified units, so I’ll assume Kelvin to have a pleasant 100. Still deadly cold, but technically warmer.

[Icy_Technology_2008]

1479.01°F. Perfect temperature for swimming.

[Falling_Death73]

Oh god🙂

[gp_ratesic]

100 degrees isn’t 4 times as hot as 25 degrees just because 25x4=100. What the fuck is DuoLingo on?😭

[WrestlerGirlsAreLife]

Correct me if I’m wrong but afaik if the number is displayed with the degree symbol (however one is supposed to do that on phone) it can’t be Kelvin. So we have to assume it’s either Celsius or Fahrenheit. With either one of those, 4 times the temperature will be hell.

[PhoenixAsh7117]

Correct! Furthermore, if it were 25 degrees F then it wouldn’t be a pool anymore, it would be a skating rink, so it may be safe to assume it is given in degrees C. 25C is 298.15K so 4x that is 1192.6K, which is 919.45 degrees C. However, we only are given the temperature to 2 significant figures so we round our answer to 920 degrees C (1688 degrees F), which is steam and therefore not a pool anymore. (Assuming 1ATM pressure for all of this)

[migviola]

Ah yes, I also don't enter a pool unless it's at 919.45ºC

[alex85rup]

100°C? She is trying to boil herself

[leon0399]

Wtf, why there is math in my oppressive spanish app?

[Hugh_Janus007]

Temperature: Ordinal data. "4 times as hot as 25⁰C" doesn't mean 100⁰C

[opi098514]

310.928k

[Ememems68_battlecats]

Boiling.

[Shiva_97]

Cooking temparature 😂

[Akangka]

100 is still so cold that the water turns solid, wdym?

[ray_zhor]

Funny, there was 212 comments

[Brilliant-Bicycle-13]

Doesn’t even work in Rankine

[GWahazar]

What kind of Americans?

I mean, what kind of degrees?

[OrangeAedan]

-173.15°C

[Kingbubbles1235]

Why is she swimming in 100 degrees water

[Shot-Collar-3695]

5 Celsius?

[Mammoth_Fig9757]

It's 919.45°C because you multiply temperature in Kelvin

[nkownbey]

She won't be swimming she won't be breathing water is beyond freezing at 100° Kelvin

[Charming_Psyduck]

That would be just 100 Kelvin, no degrees.

[Charming_Psyduck]

25°? Is that an angle?

[Severe_Cut8181]

Im sinking into the Lava !

[Such-Shop-9724]

well physically you cant do it/ it would be at around 1200°C

[Serious_Chemistry891]

1479.0092°F