Why does water look blue in a lake, but clear in a glass? (Even if it’s still lake water in the glass)

180 views

[ad_1]

Why does water look blue in a lake, but clear in a glass? (Even if it’s still lake water in the glass)

In: Earth Science
[ad_2]

Water *is* blue, but a very very very light blue. In small quantities it appears clear, but in large quantities the blue color becomes apparent.

Also the makeup of the material in the lake will effect color, ie is it a sand bottom, or is it granite stone or etc it will effect how the light is reflected and change the way it appears to the eye.

Much the same as the sky being blue, light passes through water and most of the light is blocked with only the bluer wavelengths able to escape.
A glass of water is small and doesn’t block a lot of the spectrum in such a small space.

Some lakes are VERY blue though, through natural minerals colouring it, like the Blue Lake at Jenolan Caves in the Blue Mountains, west of Sydney, Australia [Jenolan Caves Blue Lake](https://images.app.goo.gl/G2iHLABBPSKfUjcS6)