this post was submitted on 13 Jun 2024
279 points (96.0% liked)

Cool Guides

4653 readers
1 users here now

Rules for Posting Guides on Our Community

1. Defining a Guide Guides are comprehensive reference materials, how-tos, or comparison tables. A guide must be well-organized both in content and layout. Information should be easily accessible without unnecessary navigation. Guides can include flowcharts, step-by-step instructions, or visual references that compare different elements side by side.

2. Infographic Guidelines Infographics are permitted if they are educational and informative. They should aim to convey complex information visually and clearly. However, infographics that primarily serve as visual essays without structured guidance will be subject to removal.

3. Grey Area Moderators may use discretion when deciding to remove posts. If in doubt, message us or use downvotes for content you find inappropriate.

4. Source Attribution If you know the original source of a guide, share it in the comments to credit the creators.

5. Diverse Content To keep our community engaging, avoid saturating the feed with similar topics. Excessive posts on a single topic may be moderated to maintain diversity.

6. Verify in Comments Always check the comments for additional insights or corrections. Moderators rely on community expertise for accuracy.

Community Guidelines

By following these rules, we can maintain a diverse and informative community. If you have any questions or concerns, feel free to reach out to the moderators. Thank you for contributing responsibly!

founded 1 year ago
MODERATORS
[email protected]
279
A cool guide to heat absorption between different colored T-shirts (i.redd.it)
submitted 4 months ago by [email protected] to c/[email protected]
44 comments fedilink hide all child comments
 
top 44 comments
sorted by: hot top controversial new old
[–] Tehdastehdas 68 points 4 months ago (1 children)

"The amount of heat gained by a Bedouin exposed to the hot desert is the same whether he wears a black or a white robe. The additional heat absorbed by the black robe was lost before it reached the skin."

Bedouin robes, the scientists noted, are worn loose. Inside, the cooling happens by convection - either through a bellows action, as the robes flow in the wind, or by a chimney sort of effect, as air rises between robe and skin.

Thus it was conclusively demonstrated that, at least for Bedouin robes, black is as cool as any other colour.

https://www.theguardian.com/education/2006/aug/15/research.highereducation

[–] cucumber_sandwich 16 points 4 months ago (1 children)

But t shirts don't work like Bedouin robes.

[–] Numenor 5 points 4 months ago

Only if you don't know how to sandwalk, Outworlder.

[–] [email protected] 34 points 4 months ago (3 children)

So white and yellow for staying cool, every other color heats up.

[–] [email protected] 15 points 4 months ago (1 children)

Tradeoff is dark colors absorb more UV so it provides better protection from the sun

[–] [email protected] 38 points 4 months ago* (last edited 4 months ago) (3 children)

Umm…

~~Reflection is just as effective as absorption. As long as the UV isn’t passing through the fabric into you, you are fine.~~

Well butter my biscuit, I might be wrong. There are other of factors to take into account, but it makes sense that, the portion of light that does make it through a light fabric will keep on reflecting inside the garment until it is absorbed or escapes back out. Like a photography light box.

[–] [email protected] 7 points 4 months ago* (last edited 4 months ago)

Skincancer.org is my source for darker colors being better protection

https://www.skincancer.org/blog/dress-to-protect-5-things-that-affect-how-well-your-clothes-block-uv-rays/

I don't have the highest degree of confidence in it but it makes sense to me that absorption matters more than reflection because a lot of the reflected UV will be going through the shirt and onto your skin

That's why materials like linen aren't as good for UV protection. They're light weaves and let a lot of light through, still

[–] Valmond 3 points 4 months ago

Gotta get that UV colored tshirt :-)

FYI there are UV absorbant tshirts, crazily practic for kids.

[–] Tehdastehdas 3 points 4 months ago (1 children)

Look at the sun through a white shirt, then black. Which is brighter?

[–] EtherWhack 1 points 4 months ago

The white would be as it would absorb (then converted to heat) less light and would reflect it instead.

Thebottom half is highlighting the absorption by showing radiance (giving off it's own/stored energy), not reflection.

[–] MalachaiConstant 14 points 4 months ago

Red looks surprisingly effective as well.

[–] Mr_Dr_Oink 5 points 4 months ago (2 children)

Its a bit misleading. Black clothes will absorb the heat from the sun and your body and then the clothes will cool via convection. So the wind blowing through the clothes takes the heat away. White will reflect the heat from the sun away and your body back towards you.

Im sure theres some debate and probably way more to it but i have always felt more comfortable in the heat than other people and i wear darker clothes the majority of the time. If that anecdote bares any weight.

[–] [email protected] 2 points 4 months ago (1 children)

Google says : colors do not absorb different amounts of heat, only heat from light.

[–] BradleyUffner 3 points 4 months ago (1 children)

Heat from light isn't heat?

[–] [email protected] 1 points 4 months ago

Light is energy, if a medium absorbs the light it converts to heat. if it reflects it the potential heat goes away with it

[–] [email protected] 1 points 4 months ago

Are you telling me a human body is different from a manikan torso?

Seriously though, I think you're onto something.

[–] LengAwaits 21 points 4 months ago

[–] cosmicrookie 19 points 4 months ago (1 children)

I just see that all colors turn into pride colors in the sun

[–] Valmond 7 points 4 months ago

Sun turns us gay!

[–] proctonaut 16 points 4 months ago

Is there any way to tell the difference between infrared reflected between (I assume) 8 and 13 microns and the infrared emitted due to absorption of shorter wavelengths?

[–] [email protected] 12 points 4 months ago* (last edited 4 months ago)

That's not exactly heat absorbtion though. Infrared cameras capture the heat radiated by the shirts and black color is the one that radiates heat the best. That's why matt black is the worst color for a thermos and chrome is the best.

[–] [email protected] 6 points 4 months ago (1 children)

Dang green, you hot!

Also, grey... you have betrayed us.

[–] Adalast 1 points 4 months ago

So I saw this yesterday and I can't stop seeing things that may relate because green.

https://youtu.be/17Y82tJDk2o

[–] [email protected] 6 points 4 months ago

my friends make fun of me for wearing black in the summertime but i am more uncomfortable wearing non-black than i am just sweating it out 🫠

[–] [email protected] 5 points 4 months ago

Just get some loose linnen button down shirts, they are fantastic

[–] [email protected] 5 points 4 months ago

What about sequined shirts? If I get the right angle I can boil a cup of water within seconds while staying cool inside. For an extra barrier I wrap my body in foil, keeps the 5g out as a bonus.

[–] [email protected] 4 points 4 months ago (1 children)

I still can't get myself to wear a white T-shirt despite me wanting it.

[–] [email protected] 4 points 4 months ago (1 children)

My sweat will ruin any white fabric after the first or second wear.

[–] [email protected] 2 points 4 months ago (1 children)

Do you use aluminum/antiperspirants? I think that is what causes the staining.

[–] [email protected] 2 points 4 months ago* (last edited 4 months ago)

yup, the aluminum basically acts as a mordant for the natural yellowish stain of sweat and its microbial metabolites

best to skip antiperspirant when wearing white shirts. aluminum-free deodorant (there is no such thing as aluminum free antiperspirant, btw) can help mask BO but will not stop sweat. but if you like white shirts that's probably a decent trade-off.

zinc oxide is a decent deodorant ingredient that doesn't prevent sweating but does slow down microbes that eat sweat and release odorous compounds

avoid baking soda if you have sensitive skin as it can raise your skin pH to uncomfortable levels. ymmv

[–] Donkter 4 points 4 months ago (2 children)

So does black make a significant difference when it's colder? Or is it only noticable when there's harsh sun?

[–] Tehdastehdas 2 points 4 months ago

It's different: radiation of long-wave infrared balanced against absorption of ambient light.

https://en.wikipedia.org/wiki/Emissivity

https://en.wikipedia.org/wiki/Selective_surface

[–] MintyFresh 2 points 4 months ago

As someone who grew up in northern areas, not really. In fall or spring (Oct, or April) when the sun has a better angle you can notice. But the rest of the winter when the sun's at a slant? Not so much.

[–] Etterra 4 points 4 months ago

Also a good indicator of why must plants use chlorophyll, which primarily reflect green light in our planet's biosphere.

[–] iAvicenna 2 points 4 months ago (1 children)

who would have guessed?

[–] [email protected] 6 points 4 months ago

Well a dog. Could guess it I mean.

If dogs can guess things, which I don’t even know if they can. But maybe.

I think maybe a dog could guess it.

[–] [email protected] 1 points 4 months ago (1 children)

How is a light gray that much warmer than yellow? Seems suspicious 🤔

[–] [email protected] 2 points 4 months ago

I guess gray is just black and white mixed, and black does not do very well

Yellow also reflects a tonne of UV and IR light. Probably helps make it so much more visible to everything than other colors

[–] [email protected] 0 points 4 months ago (1 children)

Body puts off heat too. White reflects it back, black lets it escape.

[–] [email protected] 0 points 4 months ago (2 children)

Google says : colors do not absorb different amounts of heat, only heat from light.

[–] [email protected] 1 points 4 months ago (1 children)

Google also says to put glue on your pizza.

[–] [email protected] 0 points 4 months ago

I mean some people put pineapple on it

[–] [email protected] 0 points 4 months ago (1 children)

Body emits infrared radiation. Sun does too. They make foil-lined jackets to reflect this heat. White shirts do it too, as shown in the image.

[–] [email protected] 0 points 4 months ago

Not according to science articles on the web. infrared penetrates regardless of colour, visible light spectrum capturea or reflects the rest.