ANSWERS: 1
  • Your friend is right. The sky is blueish purple, but our eyes don't see purple that well, so the blue dominates. It's not the water in the air, but all of the molecules (O2, CO2, N2, etc) that tend to scatter short wavelengths like blue and purple, and let the longer wavelengths (green, yellow, red, etc.) pass straight through to the ground instead of being scattered in all directions. The scattering is what gives air color. If the air didn't scatter light at all, the sky would appear black to us, and the only light would be coming from the Sun, moon, planets, stars, etc.

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