eli5: Why is water clear in small quantities but blue when in large quantities?
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Water is always blue, you only notice it when there’s large amounts of it because it’s only very slightly blue. Just like how it can be difficult to tell the color of a single piece of hair, but it’s easy to tell the hair color of many pieces of hair together.
The reason water is blue is because it absorbs the red and green colors of light better than the blue colors, which means blue is what gets transmitted or reflected back to our eyes.
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