What is Temperature?
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- เผยแพร่เมื่อ 30 ม.ค. 2019
- Explains temperature on the atomic scale and all of the different scales - Fahrenheit, Celsius, Kelvin, Centigrade. What 0 and 100 means in each of the scales. A distribution of speeds and how that relates to a temperature. Boltzman’s equation for relating energy to temperature. What absolute zero is and why it is important. An example of heat transfer with an interactive exercise. Heat conduction, convection and radiation are explained.
What a teacher this guy is. Like Feynman, these guys take complex stuff and make it real world practical. Great stuff.
This has got to be the best explanation of temperature I ever saw on TH-cam.
Just found this channel, I'm binge watching!
Excellent channel Professor!!
I have understood everything from your videos so far and I didn't even study nuclear physics. I think this statement says everything about the quality of your teachings. PS.: Mad respect for your ability to write backwards. I bet you trained it a decent amount of time.
A discussion of how induction cooktops work would be a great follow up for this lecture.
Of all your videos, I must confess that this was the only one that I found difficult to understand. So many questions
Thank you, good stuff presented well.
I give him credit for explaining temperature changes by moving this hand from our left to our right, even though that is backward from his perspective. Almost everyone will do the opposite.
Video is probably flipped horizontally. He usually writes on glass in front of him, he flips the video so he doesn't have to write backwards.
@@JesterAzazel dang, brilliant deduction, Jester. Now I feel like a schlepp.
i wish i had such a cool teacher like you are one, back when i went to school :/
32 for the freezing point of distilled water and 212 for the same water to boil makes sense when you realize Fahrenheit the man wanted whole numbers for ease of calculation. consider the 180 degrees difference between those two numbers, and you'll see it's a very convenient number. 180 divides easily into 2, 3, 4, 5, 6, and 10 without the need of fractions or decimals. It's the same reason why a pound sterling was originally divided into 240 pence. Given that it was THE first standardized unit to measure temperature, on top of that (1724 vs the 1790s) it makes sense. And the main reason why the US stuck with the older English measures is because of the English themselves: we were set to go Metric but the Brits sank the French transport carrying the weights and measures we needed to properly calibrate everything on our end. By the time England went to metric, it was (and still is) deemed to expensive to wholesale adopt Metric for daily life... but we did redefine our customary measures based on metric and it's not only easy enough to convert between them, but even daily household goods like measuring cups are marked in both systems so it's a more or less moot point.
Deserves more than 400 likes!
Interestingly, radioactive decay continues at 0K (absolute zero temperature).
My High School Physics Teacher defined temperature as “A vector description of the thermal gradient”
What is Boltzmanns constant?
Conduction, convection, radiation, and reflection are important in heat transfer.
Air molecules moving at 500 m/s at room temperature? There sure is a lot going on that you don't notice.
Yeah .. and 7 more tiny space dimensions
6:03 Nitpick: A 40mph wind is not a "breeze". It's a storm.
That's what I thought so I looked it up and you're very close. It's a severe gale. I believe he said 20m/s which is 72 kph. NOT a breeze!
@@benchapple1583 Yes, a gale warning is when wind is 34 to 47 knots (~39 to 54 mph or 63 to 87 kph)
Storm warning is 47 to 64 knots.
64+ knots is hurricane warning.
(Strictly, there's some distinctions involving gusts vs sustained wind, and how is that defined anyway?)
Do also remember that how strong the wind feels (or affects buildings, sailboats, etc.) is proportional to the *square* of air speed. So 20 m/s is a lot stronger than a breeze and a lot weaker than a storm.
More nitpicks:
While our common units in USA can be weird, we're really not alone, and not everything is unusual.
Weather and indoor temperatures here are usually in Fahrenheit, but in aviation it's Celsius here and everywhere (?) else. (And altitude is in feet here and everywhere else other than Russia and North Korea, IIRC.)
Science units are usually Celsius or Kelvin. Engineering units are whatever is convenient, specified in standards and requirements, etc, and we learn to convert as needed.
0 Fahrenheit is chosen because a mixture of water ice and salt will automatically settle at that temperature making it easy to reproduce. Body temperature was supposed to be 96 so that there would have been exactly 64 divisions between freezing point of water and that.
I am not a fan of Fahrenheit but I think using a solution / reaction that always settles at a fixed temperature is a neat idea.
There is another temperature scale to know about called Rankine. Rankine is to Fahrenheit as Kelvin is to Celsius - zero is absolute zero and the increments are the same size as Fahrenheit. We use it frequently at work. Many engineering formulas, such as temperature ratios and ideal gas density, require an absolute temperature. Easily converted to and from Kelvin too - it's just a 5/9 or 9/5 ratio.
@11:00 Ouch! I shouldn't have been cooking while watching this.
Baby don't heat me! Don't heat me...no more!
It seems to me that the average air molecule would move at approximately the square root of 2 times the speed of sound. If on average air molecules collide at a 45 angle, the sound will travel slower then the average air molecule. Nitrogen molecules would move slightly faster than oxygen molecules on average because the're lighter.
The eye?
Watch at 2x
Whater & salt solution... Whait, whatt??))
Really, that scale is crazy indeed.)
The Celsius and Fahrenheit scales cross at minus 40 Celsius and 40 below Fahrenheit. Where I live “below zero implies Fahrenheit, minus “some number” implies Centigrade, or “Celsius”. At -40, it doesn’t matter whether it is For C. It’s F*cking Cold
In e-Pi-i resonance imaging of multi-phase superimposed frequency interference positioning, the standing wave-package is hyperfluid information distribution by superimposed timing modulation, instantaneously projecting "heating and cooling" by AM-FM TIMING-SPACING, the continuous creation connection Principle,cause-effect of perspective in the Universal Hologram Singularity positioning here-now forever.
"Do not believe what you think", but it's a requirement of the sciencing methodology to use a particular terminology that identifies the subject matter of the job, but it's an entirely functional relationship of time duration timing.
A Conformal Cyclical Cosmological e-Pi-i reference Constant of continuous creation connection in Eternity-now Interval, is why and how the Observable Universe is WYSIWYG.
imagine if you had spent the time thinking this actually learning this.
@@nannite I imagine you don't have a clue
8:50 haha, that body temp in Fahrenheit ought to be +100 and not -100. That's a cold person!
I think the main way is radiation, when a molecule abaorbs radiation it moves, which in turn produces electromagnetic radiation and so forth i.e conduction, when atoms move they need more space, so they become less dense than the fluid of molecules around them, and due to gravity they get pushed up, all due to radiation, but how radiation moves molecules or how molecules absorb radiation is beyond me, but it has to have to do with electromagnetic fields interacting with the fields of the atoms i.e their constituents electrons and protons. But it is just a hunch that I don't know its truth.
Minus 273C. . . Absolute Zero. Hell Freezes Over. . . Toronto Maple Leafs win the Stanley Cup 😉
Isn't Einstein creeping in here? Speed of molecular activity is wonderful, but how does space affect this activity? Put 1 finger on ice water vs entire hand, which occupies more space than 1 finger. Or is it just more mass occupying a larger space leading to more molecular activity.
Time is also an important factor isnt it? More time space Einstein stuff?