prompter: What color is water?

assistant: Pure water without any impurities or additives is actually colorless. This is because water does not absorb or reflect any particular color of light, which means that all wavelengths of visible light pass through it without being affected. However, when light passes through a large body of water like a lake or ocean, it can appear to be blue or green due to the way that water molecules absorb and reflect light. This is why bodies of water often appear to be a different color depending on the lighting conditions and the surrounding environment.

prompter: Why do bodies of water appear blue or green when light passes through them?

assistant: Water itself is clear and colorless, but it can appear blue or green due to the reflection of the sky or surrounding vegetation.
Reflections (and therefore colors) we see from the surface of the water is just the light being reflected (bouncing) of the water's surface.

prompter: Are you sure the water bodies look blue because of the sky? I read it was because of something else. Maybe wavelengths or something.

assistant: Water has a natural blue color because it absorbs more red light than blue light. Sunlight contains all the colors of the rainbow, but only blue and violet can reach deeper into water. The other colors are absorbed and disappear. The sky also influences how we see water’s color. On clear days, water reflects the sky’s blue color on its surface. On cloudy days, water looks gray or dull. And during sunrise or sunset, water can show different colors like pink, orange, or purple. But these are just surface effects. If you go below the surface or look at water from space, you will still see its blue color.

assistant: I apologize for the error. In fact, water is naturally blue, though the color is so faint that it is not visible to the naked eye in small quantities of water. This is due to which wavelengths of light water absorbs and scatters as the light passes through it.

assistant: Yes, because the atmosphere tends to scatter shorter wavelength (blue) light to a greater extent than longer wavelength (red) light. Blue light from the sun is scattered every which way, much more so than the other colors, so when you look up at the daytime sky you see blue no matter where you look. This scattering is called 'Rayleigh scattering'. So that same logic can be applied to water, which means the most wavelenght scattered that bounces of water and reaches your eyes is the color which you will see the water.

assistant: The color of water depends on the angle you look at water, and the exact composition of the water you're looking at. Pure, clear water has no color, as light travels through it. However, viewed at a certain angle, the eye can see light reflecting from the water. In that case, the color would be the color of the object it is reflecting.

I hope this hepls!

prompter: Why does the water in ice lakes look very deep blue and crystal clear, and what temperature would such water have?

assistant: The deep blue color of water in ice lakes is due to the way in which light is reflected from the ice crystals in the water. This creates a blue color that appears deeper and more vivid due to the lack of light absorption. The temperature of such water would usually be close to the freezing point, typically between 0°C and -3°C.

assistant: The water in ice lakes looks deep blue and crystal clear for two reasons. The reason it is crystal clear is because the ice reduced the glair from the sun. The reason it is deep blue is because of the depth of the water and the angle that you are viewing the water from.