Converting Between Temperature Scales (Celsius, Fahrenheit, and Kelvin)

If you're American, you're familiar with the Fahrenheit scale, so 30 degrees is cold and 100 degrees is hot. But in the rest of the world, nobody uses this scale! They use Celsius, and to them, 30 is pretty darn hot. Furthermore, scientists use Kelvin, and to them, 30 is so cold it would kill you dead! We'd better learn how to convert between this different temperature scales, don't you think?
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[@bipl8989]

Easy to do in your head C to F. 2 x C, -10%, +32 F to C C-32, +10%, ÷2 C to F C= 10 10x2 =20 -10% = 18 +32 = 50F

[@aquacandela3705]

I'm taking a chemistry class right now on this subject, but after reading the chapter over and over I couldn't understand so many things such as WHY this (32) appears in the equation. The textbook doesn't seem to make it clear and is confusing, but now after only 2:48 mins into this video I understand why it's there and it's so simple. This was frustrating me to no end, this is exactly what I needed!

[@carultch]

There is no physical reason to why it is 32 of all possible numbers. It's just how we define the modern version of the Fahrenheit scale. Fortunately, it is only 2 digits that we have to deal with.

[@bipl8989]

It's just an offset to the underlying linear conversion of F = 9/5 x C Plot a bunch of dots on graph paper using f = 9/5 x C , C on the X axis, F on the Y axis. Choose a bunch of values for C and calculate f for each value of C Draw the line through all the dots. Now add 32 to each dot. Draw a line vonnecting all those. That new line shows all the corresponding values of F.

[@bipl8989]

​@@carultchThere is a physical reason. 0°C = 32°F Both the temperature of ice water.

[@carultch]

@@bipl8989 You are missing my point. I'm saying there is no reason other than arbitrary convention that 0 C = 32 F. What exactly defines 0 F, is lost to history, as no one has ever been able to reproduce Fahrenheit's original recipe for 0F.

[@artandcraftwithbt]

THANK U SIR FOR EXPLAINING THIS IT HELPED A LOT ❤❤

[@soyelprofeabel]

The best explanation, thanks a lot

[@jessefigueroa2682]

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[@jerinjaison5580]

This man is really really great!!

[@EraoErba]

Thank you professor Dave

[@tasmiaferdous4945]

thank you very much sir !!

[@EraoErba]

Irano Erba from Ethiopia thank you so much our teachers

[@jaeljefinaj5246]

Thank you ❤

[@diepduong6637]

very good hope you made more video about science and physic

[@Sunrisestarry]

Thanks so much this is easy to remember

[@Gracekutepov671]

Thank you so much I learned a lot also I really needed it thanks

[@didi_1781]

Thank you!

[@degudebebe5535]

Thank you very much teacher !!!!!

[@betteana]

I LOVE YOU PROFESSOR DAVE

[@muqsitjalal2225]

Thank you sooo much for your videos proffessor Dave, honestly ,it helped me a lot during online class BTW, 3:31 Los Angeles is the winner😜

[@beatami7183]

Thanks alott

[@randomarun2950]

I never knew this about this, thanks! I know this now.

[@javeedairphaan6076]

Thank you so much. Love from India

[@doyin2575]

Thank you so much for the clarification.......thumbs up

[@abdalazizsawwan328]

Thanks professor !

[@galactorsus_i.n.c]

i get why kelvin is there but USA should really just use Celsius instead, well they should start making the change to Celsius bc ik it needs time to make a change like that

[@dogbarbill]

Apparently Professor Dave missed class when the conversion formula for a calculator was covered.

[@aoi1640]

I'm here to Guess how hot or cold is it This is just about Fahrenheit, Celsius and Kelvin

[@aditiverma1443]

Thank youuu so muchh..! All my doubts are clear now! My exam is tmrw 😭 I hope I will score 😅 full

[@noone12323]

What's your score 🧐🧐

[@aditiverma1443]

Unfortunately it was 50/80

[@pravin25]

​@@noone12323 my score is -273.5 K dayummmmm

[@cdfactory]

Where did you get that shirt

[@spacechip3386]

beautiful theme song.

[@tdgtwo850]

Did your geometry or science teacher took you here?

[@giovannimariotte4993]

Thank you for this videos

[@electricjeel6706]

This and a song about converting in the metric system were in the same Google form. Im in the 8th grade and I had to watch a song about converting in the metric system... The song actually really helped.

[@AnilKumar-is7wm]

Could you please make a video on how is heat transferred

[@ProfessorDaveExplains]

check my classical physics playlist

[@AnilKumar-is7wm]

Ok

[@justjerm1823]

Dude the real reason is why do I have to convert? Why can’t I just understand Celsius like the rest of the world. I love America 😒

[@carultch]

You'll still need to convert between Celsius and Kelvin, even if you do live in a country that uses the metric system. Few (if any) countries would routinely use the Kelvin scale in weather reports, everyday speech, and on most devices available to the general public. No one wants to think in 3-digit numbers for common temperatures.

[@ts37924]

Even if you guys used the celcius scale..then also if you wanted to find the value of a temperature outside the range of boiling or melting point of water wether on the celcius or Fahrenheit scale you must first find the value of that temperature on the Kelvin scale only and then convert it into the °C or °F respectively using correct formula. As the celcius and Fahrenheit scale can only measure upto a certain range that is height upto boiling point of water and lowest upto freezing point of water. Where as Kelvin is an absolute scale that can measure any temperature and doesn't have any limitations until it reaches a point where there is not temperature left to measure and all molecular motion ceases.

[@pravin25]

Because because (😂) of today is Monday

[@maahirsharma2001]

Sir Why is that the temprature of a gas cant go below -273K?(Which is the least temprature that can be achieved.). Also why did we needed the Kelvin scale,was it due to tje absolute tempratures of gases?

[@Vinny.Macedo]

You mean -273ºC right?

[@ProfessorDaveExplains]

you can't have negative numbers in kelvin, that's the point of an absolute temperature scale, no negative numbers. so 0K is -273C, but we can't go below that as 0K represents a complete absence of heat energy. check out my physics tutorials on heat and temperature and thermodynamics for more about why this is the case!

[@ts37924]

It is because all kind of molecular motion ceases at the absolute zero temperature and if there is not motion of molecules then there is nothing such as temperature therefore if there is no temperature then how can we measure it... temparature determines the motion of molecules in matter when there is no motion of molecules there is no temperature.. temperature like all physical quantities is quantification of physical properties of matter and in this case motion of molecules is the physical property if matter which when quantified is called temperature just like mass is the quantification of the inertia of a substance and inertia of a substance is a physical property of matter.

[@aoi1640]

I just got a Ad about Homework Sucks The Ad was Relatable

[@arantxaubide3119]

ok

[@redcroat]

Wait isnt 1°C=274,15 K,

[@learning-pe9ww]

👍👍👍

[@danag5610]

Is there a way to convert fahrenheit to kelvin?

[@ProfessorDaveExplains]

No you have to hit Celsius first.

[@PyrusLex86]

F = (9/5C)+305.15 and K=(5/9(F-32))+273.15 would do it in one hit as K is just (C+273.15)

[@vijayrana1386]

2:45 that's what u came for....thx me later....

[@Baby-zs9jv]

Damn damn damn💯❤️❤️❤️❤️

[@Lpp360]

°Kalvin is superior.

[@jorgesolis7891]

But is the same temperature....

[@St0neyBal0gney]

Fahrenheit 0° Really Cold Outside 100° Really Hot Outside Celsius 0° Fairly Cold Outside 100° Dead Kelvin 0° Dead 100° Dead

[@ValorZeroAdvent]

What concentration of brine is used in the calibration of a Fahrenheit scale?

[@ProfessorDaveExplains]

good question, i dunno!

[@ValorZeroAdvent]

Ah, it's fine. Regardless, I find Fahrenheit very unintuitive because the boiling and melting point of water are assigned seemingly arbitrary numbers, and you can't tell by just glancing without any prior knowledge of the imperial scale. The average person wouldn't use saltwater in a significant scale generally, and so Fahrenheit didn't make any sort of practical sense. I just wish America adopts the metric scale like everyone else in the world someday. It's getting real annoying whenever I talk to my American mates and talk about weather and temperature. I just can't understand imperial without seeing myself spending way too much time learning a new scale I will never use, especially when metric does the same job and arguably better at it.

[@sodalitia]

Its easy: it depends how many spoons of salt you added to a teacup of water. The same simple rule applies to imperial measure of length: How much is an inch? The answer is: how long is a stick? I don't get it, why people don't understand imperial system. Its a simple system for simple people.

[@MasontheMarxistDog]

The us should use kelvin

[@stevealienman767]

No the whole world should use Fahrenheit with the US because Fahrenheit is more precise in measurements when the temperature is changing. I hate metric scales in temperature all of the other metric measurements are okay in the world just get rid of stupid Celsius and Kelvin use Fahrenheit everywhere

[@oliverjudson1834]

@@stevealienman767 no its not

[@jesantonihevileon8611]

What really count's and matter is what the human beings it's going to feel in theirs skin in winter time. All those 3 scales seems were doing to complicate the human mind. Aboriginals peoples knows very well when was cold and hot without using any of those thermometer 🌡️. But European so called " civilización " only have complicated the way of living today.

[@grantfloyd3392]

mr k sent me here. pls help

[@madeleinemogavero4407]

AHHAHAHHA GRANT

[@abdullahzahid9676]

Hahaa

[@NonnofYobiznes]

*9/5* ? Pfff.... it's easier to multiply by 1.8. Nice try , but no cookie professor. Shouldn't you try to simplify things not just make them more complicated?

[@cdfactory]

Bro stfu you’re mad over a fraction 😂

[@carultch]

The last time I checked, 9/5 is identical to 1.8.

[@stevealienman767]

No the whole world should use Fahrenheit with the US because Fahrenheit is more precise in measurements when the temperature is changing. I hate metric scales in temperature all of the other metric measurements are okay in the world just get rid of stupid Celsius and Kelvin use Fahrenheit everywhere

[@ProfessorDaveExplains]

Kelvin is what scientists use. Actually learn things.

[@oliverjudson1834]

kelvin is actually better

[@oliverjudson1834]

lol the imperial system makes no sense

[@oliverjudson1834]

Fahrenheit is idiotic

[@carultch]

@@oliverjudson1834 For most units, I'd agree with you, but Fahrenheit actually makes sense, and has a very practical application. It is roughly a 0 to 100 scale of the general temperatures you'll experience as the temperature of your surroundings. The first third of this scale is freezing cold. The middle third is cold, but not freezing. The 2/3 point is the neutral comfortable temperature. And the upper third is warm to hot. Celsius is useful when there is value in keeping track of water's phase change points as milestones of the temperature scale, but it isn't as useful for reporting the temperature in human terms, in numbers most familiar to the general public. You have to use -20C to 40C to represent approximately the same temperature range that 0F to 100F represents.