The ocean appears blue because water (instead of scattering) absorbs red and yellow light, and blue is all that's left. If you take a red object deeper and deeper in the water, it will appear less red because there is less red light left to reflect off of it into your eye!

@WillowLemmons

3 жыл бұрын

And that has to be true because when inside the water is always clear

@muhammedrazal9245

3 жыл бұрын

What happens to the red and yellow absorbed by the water?

It's pretty amusing to rewatch your old videos. Your stance and your "acting" in general got so much better over time, which makes these videos look so amateurish (in comparison, not in general) ^^

@AyoJayArr

2 жыл бұрын

Just did it 8 years later lol

I've never heard it explained better than here. Amazing, thank you

I think what you're referencing is when light comes from water into air, not the other way around. The critical angle comes into play in that direction.

For the sky, picture a beam of light stretching left to right across the sky. The blue wavelengths of light in that beam get reflected down into your eyes, so you see "blue" when you look at the sky. The red, orange and yellow continue on their path appearing close to white light (a mix of wavelengths). Anything that has color looks that way because it reflects that color back to us (or filters all other colors in the case of glass)

Thanks! Also the same reason the moon can appear red near the horizon.

I'll take a KZread education over sitting in a stagnant classroom (which thankfully I'm done with :) Subscribed

You should remake this video, it’s a question I think a lot of people have and I know you can explain it better now :)

@AlexGonzalez-ye9pc

2 жыл бұрын

I agree

I'm subscribed to a lot of educational channels, and a lot of them seem quiet repetitive and unnecessary, but I love this format and the questions! Great videos!

Another great question. William Ewart Gladstone's "Studies on Homer and the Homeric Age" is where most of this color study comes from. He analyzed the use of the word κυανός, which is used in the passage you're talking about. Today it means "cyan" or a light blue, but in Homer's time was used to describe everything from light green to dirty, aged copper. We know it as blue, but they probably didn't.

It's hard to imagine! But there are interesting reports from people who have the lenses in their eyes removed (or have a condition called aphakia) and can sense a little bit of the UV range the lenses normally block. They say the sky looks violet!

There are many other ways that the sky can appear various colors due to the various pollutants, dust or other things in the air, but we didn't have time to look into all of them for this video. Check the references linked in the description and there's a really great article all about those other colors

Excellent question. There's no theoretical limit to the number of colors there are, since between any two colors is another color (according to wavelength). At some point our eyes would stop picking out differences, surely, but it's more likely that we've just defined enough colors (and finished describing our rainbow) and don't need new ones. Yet.

I love the way you explain things, its very well put!

I think you'll like the next episode, then. Stay tuned! :)

Veritassium answered this same question in a different video and said that the reason for a blue sky instead of a violet sky was do to the fact that our star, the sun, emits light more in the blue range rather than the violet range. This explanation along with the photo-receptor explanation given in this video both seem sensible. I am curious as to which explanation is correct or are they both correct?

Seriously amazing and so simple. Thank you

Really like. Just discovered/decided this morning that my favorite color is sky blue. Decided to look up something to post on FB. Found you. I am a geec also, so I was pleased to see all the nerdy approach to the color. It's quite suiting that this would be my favorite color. :) Thx. Liked and subscribed.

Him: the sky isn't always blue right Me: absolutely it is, oh wait

You are correct, throughout a day the Earth rotates the other direction. But we were clearly traveling backwards in time! That's my excuse and I'm sticking to it :)

Makes you wonder if anything is really any color, or should we be saying it "appears" that color :) Deep thoughts.

Actually, the sky is black (look up at night). The atmosphere during the day scatters light such that you see it as blue, except at dawn or dusk where as he explains the long wavelengths are all you end up seeing (as scattered light).

thanks, I will definitely check out it out!

Just for the record, this is the same phenomenon that makes stars twinkle. Great vid, subscribed.

Awesome video! Thanks for posting. They should show these in schools to help alleviate the myth society and the education system has taught them that science is boring. Keep up the good work.

Learning something in just a couple of minutes--for free. Thanks!!

This is fantastic!!!

Great music in this one!

I'd never actually thought of it the way your conclusion came around. I'm surprised I hadn't but thanks

Great video! I'm a new subscriber and enjoying your channel thoroughly (: I was wondering if in the future you could talk about the color magenta (pigment vs light)? I know that sounds a bit strange, but I've been boggled by magenta ever since my friend said that it wasn't a "real color", as it falls between red and purple in a color wheel but doesn't appear in the light spectrum. As I understand it, it is reflecting back equal parts red/blue light, but how and why does this happen?

I'd like to see something about time. Why does it always seem like times takes forever when you're sitting in a lecture hall listening to your professor ramble, yet when you're doing something that you find enjoyable time zips right on by.

Occasionally while at sea on an extremely clear day, sailors see the "green flash" at sunset. This is when the last light from the sun which is already slightly over the horizon quickly progresses through the visible spectrum, and the unexpected color green registers perceptually strongly for a very brief time.

Not necessarily, because we can't predict different evolutions! But there is definitely some violet light that we aren't seeing because our photoreceptors aren't evolved to see it. Birds, butterflies, bees and mantis shrimp all can, though.

The way this guy explains things, especially in this episode reminds me of episodes of Pete and Pete. Sounds exactly how big Pete would when he had a profound revelation

please do remake with more visual explaination

I guess I wasn't specific enough, but I can see your point. Thanks.

hey guys love your videos, I was wondering if you could do a video on the structure of an atom? I would really help me with my science just the great ways you guys explain stuff, thanks

Could you do a video on pesticides? Like, DDT and stuff?

I like your videos but I would like to ask if you pease can add english subs to the video. I'm having a little problem because where I live is a litte noisy and I don't listen quite well. Thanks guys and keep going the nice work!

The Earth was rotating the wrong way...

@randomanimations1505

3 жыл бұрын

Haha

Great stuff! I remember when I was a kid my teacher told me that the sky was blue because the ocean was blue..

I wish someone could have been able to explain this to me when I was little! Of course, I've known this for a million years but nobody around me could explain it!

wow i learned something today, thank you :DDDD

little joe, so cute

I'm honestly still confused by this. If blue "scatters more" I would expect the sky to ALWAYS be red or orange, because more blue light would end up scattered AWAY from our eyes and back into space (in comparison to red). I don't understand how it scattering more than red makes the sky blue at noon, but once it's scattered even more it dissipates and the red dominates (which I expected to happen from the beginning).

@auifiraq218

6 жыл бұрын

Scattered as in through the atmosphere and into our eyes. It's talking about the white light scattering into its different coloured wavelengths, not blue waves scattering away from earth.

Thank You! And I want to see ALL The Science!

Blue isn't the only thing getting through. Just that the blue scattered light is actually coming from the sky where the direct sunlight isn't. If we didn't have the atmosphere to scatter that blue light back, the sky would be black. Minute physics explains it fairly well in his video called "Why is the Sky Dark at Night".

@sovata when you watch the sky the light that you see isn't coming directly from the sun (unless you're watching in its direction) but has been scattered by the atmosphere: during the day the sky has the colour of the scattered light.

Amazing, though the next thing that I'd would like to know is why do some songs get stuck in our head? I've researched but haven't yet found a good answer :/

More anatomy videos please!!!!

Wait... so, the sky is purple? My whole life is a lie!

I have a science question. If the cones in our eyes see red, green, and blue, and red, green, and blue are primary colors for light, why are the primary colors for pigments red, yellow, and blue?

@LadyPyrien

9 жыл бұрын

technically, they aren't.. the primary colors of pigment are cyan, magenta, and yellow. those are the colors they use in printer ink - along with black- to create every other color. Despite everything your'e taught in art class and school about red, yellow, and blue, if you actually used these colors to mix for new paints, you usually end up with gross colors, or not what you wanted in the first place other than the yellow green color, or the yellow orange.. and while you can mix them to get green, orange, or violet, you can hardly end up with anything only than a yucky brown if you mix too much in search of that perfect shade of blue for your flower, or green for the sea... I suppose to answer the question itself, if those are the colors we're sensitive to, then why are primary colors different? I don't quite know that one : P it is a good question I'd also like answered~

@DANGJOS

4 жыл бұрын

@@LadyPyrien I don't know if anyone is still around, but there is an answer to that. It has to do with the fact that light is being absorbed rather than emitted.

For more on blue skies and rainbows here is a great lecture from physicist and professor Walter Lewin. TU Delft - Professor Walter Lewin: Rainbows and Blue Skies

I'm pretty sure the water in swimming pools appears blue because of the chemicals you add to it to keep it clean. That's why some pools appear almost perfectly clear but with a slight blue tint, while others look notably blue.

The last shrimp I asked, punched me in the face

Thanks! Fixed.

It reflects the sky mostly. Ever seen a deep blue sea while it's overcast?

Would be so cool to see some of the UV and IR colors. How I envy some other animals to have such eyes :/

Hi! I would really like to see a video about how light travels through water and liquids. I need this to solve a debate with one of my friends. Thanks!

@HappyPhantom1984 thanks, I actually appreciate that.

you should do a video about "heat haze" mirage experienced when viewing objects through a layer of heated air; /mirage wikipedia

Could you do a video on arora borealis? Or the Northern Lights. I don't know why their called northern as they have been seen in Scotland...

@besmart

9 жыл бұрын

Vaperind M.M.E One of the first videos I ever made was about auroras, check it out: kzread.info/dash/bejne/jIqIxNGlqdLIk6g.html

Green is a wavelength that appears between the red and the blue on the spectrum, so why don't we ever see a green sky, even for just a second a day?

What color is the sky Ai amour ai amor U tell me it's red Ai amour ai amour U MAKE ME POCOLOCO

SO COOL

so what make the blue in the ocean? blue/green algae?

I haven't watched the video yet but I can its because the light from the sun has to go through the atmosphere and all of the water particlesget in the way and refract some of the wave lengths in different directions and blue is the main color that can pas through, that's why in the morning during the sunrise or during sunset we see reds yellows and oranges because the wave length get reflected to the side and because the sun blah blah you get the point.

interesting, I recently heard that various types of air pollution play a factor as well. could we say that different composition of polluted air, as compared to 'cleaner' air has the ability to refract and disperse the different frequencies of light more? that would explain why past cultures didnt get such a kick out of a blue or bright orange sky as much as we seem to.

You guys should dwell into the concept of reverberation. I would love to learn about that.

0:49 Neil deGrasse Tyson is going to be SO mad at you for rotating the Earth the wrong way.

So animals with different eyes see different colors in the sky?

How does the mantis shrimp see the colors we see? Their eyes are so much more complex, do you think they see a violet sky?

Hello ¿Why when is hot like a road, and gas or an engine the horizon seems blurry?

That's right. Water is completely colorless. Pure water that is, of course. A brown lake contains probably brown water :-)

>"blue is one of the last colors that cultures pick out a word for" Does that mean that our culture has already named all the colors?

What about green light? Are our eye receptors unable to detect that as well?

"My God, how much blue you spend, so that I can't see You"... (Odysseas Elytis, Greek Poet, Nobel prize winner 1979).

So, in a way, when we look up, and we see the white light coming off the sun, that's the other colors, like red and orange, shooting across the sky, while the blue is going directly to us? If that's the case, I wonder how the sky looks to a person who's colorblind and can't see blue....

Exactly what did they call the color of the sky before the word "blue" was invented? And furthermore what was the word for any other physical entity before a word for it was invented?

Water is blue, it's a very faint shade of blue but in large quantities it becomes darker.

Wow i was watchimg this and when he said by now its 3:01 it was 3:01 for me which he said at1:58 and my brother texted me

I want you to know that I like what you do, and the following criticism is not just a blind attack or anything. I'm trying to make it constructive. 1. Please stop wiggling when you talk while you're standing up. 2. Please try to be more natural and enthusiastic in these videos. Thank you.

lucky freaking mantis shrimp.

So I know this video is really old but does this mean that older species of humans, and some different species in general see a purple sky?

I have a question,why is it we can have a sunset where right around the sun is red/orange but further from it its still blue would it not be opposite if anything since the area that is blue should be traveling farther. O ---------- --------- • ^Sun ^Red ^Blue ^You

Lord Rayleigh= One piece

Good video. Be careful that your persistent annotations don't cover relevant info in your videos (the 'subscribe for more science' covered the labels for the different wave lengths on this one).

why then is the sky blue right after sunset or before dawn? That twilight period?

@ecotrademarketing4401

4 жыл бұрын

Ask google

I understand what you are saying about the scattering of wavelengths, but if thst is all that causes the sky to be blue then why is the sky yellow and white in the driest months in the middle east if water vapor plays no role in the coloring of the sky?

Erratum: not violet but indigo (1'53")

So... is the sky ever green?

is it the same way that moon near the horizon looks orange?

@jasonneu81

7 жыл бұрын

Basically yes, since the moon only reflects the sunlight and doesn't shine itself.

@argol21

5 жыл бұрын

basically, yes.

Radiolab Season 10 Episode 13 - Colors

Great video! I have one minor criticism though: when you played the music in the background I had a hard time to follow your speech. I think that's because I'm not a native speaker...anyway, maybe you can leave out any possible distractions?

@ecotrademarketing4401

4 жыл бұрын

Use subtitle, it can help

Well I just watched it, I just had my colors flipped around....

The English subs should be up, under the CC button. Enjoy!

So the sky is actually violet but our eyes only see blue, explain that more thoroughly

No that’s not completely wrong, O2 is blue

This video raises the most fascinating question... and then doesn't even answer it! What do you mean, ancient cultures didn't come up with a word for blue until late? Are you trying to say that the sky didn't look blue back then? Argh! Explain, please explain!

Mars has a reddish/greyish sky