Answered

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blood color is red, but why human vein is appear under skin as blue or green?

Sagot :

AyeDave

Answer:

Simply, its light patterns. blue is more scattered than red, pretty much it can only reach to the skin.

Explanation:

https://theconversation.com/ive-always-wondered-why-do-our-veins-look-blue-when-our-blood-is-red-83143

this can as well help to take a look at.
blue light has a short wavelength, and is much easier to deflect than red light.
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