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Black colourisa very good absorber of heat. So, in summer black clothes absorb all the heat from the sun directly and reflect out nothing which make us feel even more hot if we wear them. Thus, in summer white or light-coloured clothes are srictly recommended to wear instead of black clothes.

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The clothes which are dark in colour absorbs the heat and don't let it escape from it's surface ,since black is the darkest colour ever known by now so when it is summer it is advised to wear light coloured clothes .
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In summer already the enviroment temperature is high, so the amount of temperature received by any object is more compared to winter. When we wear the black colour dress, it has the capability to absorb the entire sun light (falling on the dress, ie no reflection, since for a black colour no wavelength). For example green colour (~6000 A wavelenth), it will reflect the particular wavelenth and absorb other wavelenth. But for a black colour (No wavelength, so no reflection, only absobtion occur).. This is the reason. To avoid this heat absorption we can wear the white dress ( since white colour is a combination all wavelenth, so it will reflect all wavelength, here reflection only , no absorption)...

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Black is not actually a color, when an object absorbs all wavelengths(all seven colors) of light it appears black. That's why in summer you will feel hotter as black colored clothes absorb all the light falling on it and get heated.

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Black coloured clothes absorbs to heat but white coloured clothes reflect to heat

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