Light Reflecting colors
- Thread starter RalosZek
- Start date
It was known that it doesn't matter what color it is, it matters on the object e.g. the light wave could be absorbed by the object, in which case its energy is converted to heat. The light wave could be reflected by the object. And the light wave could be transmitted by the object. Rarely however does just a single frequency of light strike an object. While it does happen, it is more usual that visible light of many frequencies or even all frequencies are incident towards the surface of objects. When this occurs, objects have a tendency to selectively absorb, reflect or transmit light certain frequencies.
Proven wrong!
Forfeit: Light coloured clothes
Answer: It doesn’t matter, just wear something light and loose if you want to stay cool.
It is strange that Bedouins, who live in hot deserts, wear black robes, but a study done by Tel Aviv University and Harvard has shown that the amount of heat gained by a person in the 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.
A man stood in the desert for 30 minutes, facing the sun four times, once in a black robe, once in a white one, once in an Army uniform and once half-naked. The results were surprising, they found that the man was equally cool irrespective of the colour of his robe. It worked like a chimney, because the air is hotter underneath the black robe, it rises more quickly up and out of the loose robe and, by convection, is replaced by the cooler air beneath it.
link
Forfeit: Light coloured clothes
Answer: It doesn’t matter, just wear something light and loose if you want to stay cool.
It is strange that Bedouins, who live in hot deserts, wear black robes, but a study done by Tel Aviv University and Harvard has shown that the amount of heat gained by a person in the 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.
A man stood in the desert for 30 minutes, facing the sun four times, once in a black robe, once in a white one, once in an Army uniform and once half-naked. The results were surprising, they found that the man was equally cool irrespective of the colour of his robe. It worked like a chimney, because the air is hotter underneath the black robe, it rises more quickly up and out of the loose robe and, by convection, is replaced by the cooler air beneath it.
link
Its to do with the colour spectrum and how the colour of your clothing absorbs the LIGHT.
E.g
White reflects light, as the light from the sun is "white light" as it contains no colours of the spectrum. However black does so it absorbs them. Green will absorb all BUT green. Reflecting the green rays of light, causing you to see green clothing.
Its something like that... its how you see colours.
E.g
White reflects light, as the light from the sun is "white light" as it contains no colours of the spectrum. However black does so it absorbs them. Green will absorb all BUT green. Reflecting the green rays of light, causing you to see green clothing.
Its something like that... its how you see colours.
Its to do with the colour spectrum and how the colour of your clothing absorbs the LIGHT.
E.g
White reflects light, as the light from the sun is "white light" as it contains no colours of the spectrum. However black does so it absorbs them. Green will absorb all BUT green. Reflecting the green rays of light, causing you to see green clothing.
Its something like that... its how you see colours.
FALSE. Read post before yours.
- May 19, 2003
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heat, light and radiation are completely seperate.
your thread title is light reflection. yet your thread topic asks about heat absorption.
smavid is completely correct. black absorbs all colours. white reflects all colours. green will reflect just green. yellow, just yellow.
this has nothing to do with heat.
makes restate what you actually want to know from this post. if its true whether white and black reflect colours. or if it makes a difference what colour you wear to how much heat it absorbs.
your thread title is light reflection. yet your thread topic asks about heat absorption.
smavid is completely correct. black absorbs all colours. white reflects all colours. green will reflect just green. yellow, just yellow.
this has nothing to do with heat.
makes restate what you actually want to know from this post. if its true whether white and black reflect colours. or if it makes a difference what colour you wear to how much heat it absorbs.
its false.. . that's why they teach it in physics?
Its true if you wear black clothes you get hotter than if you got a white top on. Have you never seen those bin bag kites? Where its just one big black bag, floating while tied to a string? Its due to the light being absorbed by the black, transferring into heat. Thus causing the inside of the bag to heat up, causing it to rise.
Now the reason for wearing black in the desert is due to it causing as you said a convection current, which for people who don't know is when the heat rises, and "sucks" colder air into the place from which its just risen from. Causing a loop effect. Now due to the black robe absorbing the light which is converted into heat, it caused this current. Now this didn't happen to the guy in the white robe, as his clothing reflected the light, which didnt give him this heat energy from the light to cause the same effect the black robe did.
Source 1
Source 2
So it isnt down to the colour its down to the style of clothing.
Its true if you wear black clothes you get hotter than if you got a white top on. Have you never seen those bin bag kites? Where its just one big black bag, floating while tied to a string? Its due to the light being absorbed by the black, transferring into heat. Thus causing the inside of the bag to heat up, causing it to rise.
Now the reason for wearing black in the desert is due to it causing as you said a convection current, which for people who don't know is when the heat rises, and "sucks" colder air into the place from which its just risen from. Causing a loop effect. Now due to the black robe absorbing the light which is converted into heat, it caused this current. Now this didn't happen to the guy in the white robe, as his clothing reflected the light, which didnt give him this heat energy from the light to cause the same effect the black robe did.
Source 1
Source 2
So it isnt down to the colour its down to the style of clothing.
Boring people like myself? That's a rather large assumption. Sorry if I didn't find you post remotely interesting, I must be unintelligent.
Narrow minded prick.
Are you calling me a 15 year old?
Also i've completely crushed your theory, yet you still claim your right im wrong? Your a fool, who obviously failed at physics.
What was the point bringing this **** here?
Yes, some colours reflect heat better than others, but the material has to be conductive in the first place.
Yes, some colours reflect heat better than others, but the material has to be conductive in the first place.
- Apr 16, 2007
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But tbh, it isn't just scientifically proven that white clothes are better to wear in the sun than black clothes. It has been tested by people, and why is it that everyone on holiday wears white/cream clothes and not black?
Because the colour white doesn't absorb the light.
Tbh, no point in this thread. Close it imo. It just makes everyone argue over nothing.
/kizza
Because the colour white doesn't absorb the light.
Tbh, no point in this thread. Close it imo. It just makes everyone argue over nothing.
/kizza