Blue is one of the three primary colours of pigments in painting,what's your color preference?
I personally love red. Why do you like blue?
Because whenever I look at the daytime sky and the deep sea appear blue because of an optical effect known as Rayleigh scattering.
Rayleigh scattering? What is that? I have never hear of this. 
Its the is the (dominantly) elastic scattering of light or other electromagnetic radiation by particles much smaller than the wavelength of the radiation
I see, what else do you know about the color blue?
blue may differ in hue, chroma (also called saturation, intensity, or colorfulness), or lightness
Blue reminds me of the deep ocean. Its a very calming color, dont you agree?