Misconceptions About Temperature

Misconceptions About Temperature

When you touch an object and it feels warm
or cold, what is that really telling you about the object? Here, I have a metal hard drive
and a book and I’m going to ask people to compare their temperatures. Which one do you
think will feel warmer – the book or the hard drive? The temperatures? Yeah, tell me if one is hotter or colder or
if they’re the same temperature. How do they feel? This is slightly cooler than this one. Oh, that’s warmer. Yeah, agreed. I’d say the hard drive is a lot colder than
the book. ‘Cause the book’s got more knowledge. Why do you think that is? Metal’s normally a little bit chillier if
you leave it in a colder temperature. What if I said they’re both the same temperature?
What would you say? I’d tell you you’re lying. I’d think you were lying, yeah. Well, maybe the way I can prove it is I have
an infrared thermometer. What do you think we’re going to see? I think science might be able to answer that.
And I’m not a scientist! Make a prediction for me. I still think that’s colder. Would you bet me money? I don’t have any cash. Let’s measure the temperature of the book.
What do you see? 19.0. OK. Now measure the temperature of that. 19.0. Alright, well, now I believe you. I’m trying to figure it out, actually. Trying
to figure out why’d they be the same temperature. They don’t feel the same temperature, though. So, why does that feel colder if they’re the
same? Good one. You know the answer? I’m coming to you guys for answers. We’re creatives, not intellectuals. Well, create an answer for me! I’m not a scientist! Come on, you tell me. I’ll try to answer that question with another
little experiment. Here is an aluminium block. Ooh! Nice and cold. And a plastic block. How do their temperatures
compare? Completely different. Aluminium’s going to be much colder. Yeah? This actually feels colder. Let’s take this to the next level. I’ll put
an ice cube on both plates. What will we see? I’m guessing it would stay solid on this one
and melt on this one. So it’s going to melt on the plastic but stay
solid on the aluminium? Yes, but maybe I’m wrong. That one will melt more quickly than on the
aluminium. You’d think so. Yeah, ’cause it’s cold. I think they’re the same. We put an ice cube on each of those. What
do you see? It’s melting quicker on the aluminium. My God, it’s melting! This is melting quicker than that one, even
though this is aluminium and that’s plastic. So which one felt colder? This one. How does that make sense? No idea. Could aluminium be bad for the environment? How would aluminium be bad for the environment? It’s thawing the ice quicker, isn’t it? You want the answer? Yes, please! It’s about thermoconductivity – the rate at
which heat is transferred from one object to another. So when you felt these blocks
originally, I know this one felt a lot colder. But you know from the other example we did,
that they must both be the same temperature. True. They’ve both been outside for a while. We
see the aluminium block is melting the ice faster than the plastic block because it’s
conducting the heat to the ice cube faster. With the plastic block, it’s a worse thermoconductor.
So, heat is being transferred less quickly to this ice block and so it’s staying iced. OK. I believe you. Make sense? Yes. Definitely. In our first example, the hard drive felt
colder, even though it was at the same temperature as the book. That’s because the aluminium
conducts heat away from your hand faster than the book conducts heat away from your hand. Sure. That seems logical. Which makes the hard drive feel colder and
the book feel warmer. So when you touch something, you don’t actually feel temperature. You feel
the rate at which heat is conducted, either towards or away from you. Think about this
next time you hop out of the shower in winter. It’s much nicer to stand on the bath mat than
on a towel beside it. Not because the bath mat is warmer but because it conducts heat
less quickly away from you.

100 thoughts on “Misconceptions About Temperature

  1. I think this is bull. The gadget he used to measure only took a surface measurement and not a core measurement so he is giving false info.

  2. oh god… *facepalm*… the majority of people are so ignorant in basic things.. or even don't have basic intuition… this is why the world improves so slowly or regress sometimes

  3. "Misconceptions"… But there was only one misconception 🙁 and it wasn't even a misconception for me. Here I am, hoping to learn something new while I procrastinate from my painting tasks at 4:48 in the morning and didn't even get anything new. Obviously a sign I should stop wasting my time on youtube.

  4. It’s the same concept as opening a window or door in your room in the winter time or at night. Cold/cool air is not coming into your window/door; the hot/warm air is actually leaving through your window/door.

  5. I told my wife that she isn't hot, she just radiates energy quickly. I'm now sleeping on the slow energy radiation sofa.

  6. Can’t compare different materials temperature reading using an infrared thermometer. Different materials radiate different spectrum at same temperature.

  7. TBH, It's bad video. the guy was explaining to "regular" people, he should avoid using scientific term. I mean don't confuse them with "conductivity", but just tell them, "it takes the heat away".

  8. @veritasium , can you please differentiate heat from temperature.

    temperature being the speed of the atoms vibrating vs heat being the energy released from said vibrations.

    thanks, i enjoy your videos!

  9. I also think in the same way, that feeling cold means heat is transferred away from you and feeling hot means heat is transferred towards you.

  10. This is Dumb. Infrared thermometers have to be calibrated to a specific material. Metal does reflect more infrared rays than a book (wood).

    Go and study the manual..

  11. Give these guys a brain. Plastic is an insulator and Aluminium is a great thermal conductor. This is basic knowledge from primary!!

  12. It's the same ignorance that makes then wrap sandwitches in alluminum foil "to keep it warm".
    The alluminum foil is good while warming food but bad for keeping it.

  13. If we don't feel temperature when we touch objects, what do we experience when we get burned by a very hot object? Is it that we don't actually feel the temperature, but are some how able to create the sensation of pain? I need more science!

  14. So does that mean that if the aluminium and the plastic were the same temperature as the skin of your finger, they would both feel the same? Despite better thermal conductivity, the metal couldn't conduct the heat away if it's already at the same temperature.

  15. The easiest example for me is this: Imagine standing outside at let's say 15°C with no clothes on. There is also a lake and the water has the same temperature. If you had to spend an hour or two before you could go home would you go into the water or stay outside?

  16. Damn I was able to predict the ice melting faster on aluminum since plastic is a better insolator and Ice would transfer heat faster to the aluminum, but the hand one, pretty cool ^^.

  17. I was yelling in my head "Thermal conductivity! PLEASE say the word" and "It's your hand that's melting the ice cube!!!"

  18. Well actually the temperature will be a little bit higher for the more conductive material after these people were touching them. Not likely very noticeable, but significant nonetheless.

  19. I feel they didn't understand the explanation but kept nodding so that they don't look stupid. Because that's what I was doing so ik😂

  20. Same goes for colour… no object is actually the colour our eyes sees, in fact it’s every colour but the colour we see, as our eyes only see the colour light length that wasn’t able to penetrate the atoms on that object, therefor it gets reflected back to our eyes and make it seem “coloured” in the colour it rejected

  21. LOL!!! aluminum is bad for the environment because it's thawing out the ice.  OMG.  Tell the snowflakes to stay away from aluminum.

  22. Please please please can you do a slightly more complete, though equally simple video to explain convective, conductive and radiant heat loss and gain.
    As an environmental housing consultant, I have spent much of my life having to explain the differences in how we and our houses experience heat and cold to people.
    One of my favourite puzzles tgat i think you might like is:
    Given two otherwise identical electric kettles, one made from polished stainless steel and the other from white plastic… Under the same conditions which one will come to the boil faster, and which one will stay warm longer.
    Similar to your current show i often ask people about the air temperature outside on a 17 degree sunny day, as compared to standing under the shade of a tree with a breeze blowing on the same sunny day…
    But a small short video woukd be great, and if i knew how to make one i probably would haha

  23. have they studeid? now i can approve finnish school system. i knew and was able to calculate a lot of things from thermodynamics

  24. Even i deduced what happened and i am just 14. My friend was correct, americans dont know How to think, they just eat hamburgers. Just kiding americans your president is a piece of Apple's dildo.

  25. If you had a thermometer accurate and precise enough, would you be able to measure the temperature of peoples fingertips to show how metals feel colder? Or am I missing something?

  26. In case you were wondering who that smirking guy is that regularly keeps interrupting the content; it's Derek Muller "Canadian science communicator, filmmaker and television personality (and self created Wikipedia page poster), who is best known for creating the YouTube channel Veritasium"

    But who also besides mugging his way to some kind of you-tuber fame also is "a Facebook critic, and has denounced the ability to buy likes for a Facebook page illegally from "like farms" Gosh; at least he's working to better this brave new world in a tangible way! You go Derek!

  27. Hey can I ask you a question?
    5 seconds later
    No you’re wrong, stupid idiot I bet you don’t even know why what I just said makes sense…. do you know why… well try and figure it out 😂

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