how is the sea blue ,but if you put it in your hand or a bucket it is clear ? it couldnt be the sky because at night

Question: how is the sea blue ,but if you put it in your hand or a bucket it is clear ? it couldnt be the sky because at night when the sky is black the water is still blu???
- Keywords:
  blue,
  sea
Asked by anon-244579 to Ondrej, Jordan, Eleanor, Ed, Christine, Alice on 16 Mar 2020.
- Edward Banks answered on 16 Mar 2020:
  
  This is really just a question of scale! Water does absorb different colours of light differently- it absorbs longer wavelengths like red more strongly; meaning that the light that comes back is blue-tinted. But the more water you have, the more it will absorb the light: in a glass of water there isn’t enough to really absorb much so it still looks mostly clear. By the time you get to even a bathful of water it starts to look a bit bluer.
  More water means more light absorption, so the ocean looks even bluer still.
- Eleanor Jones answered on 18 Mar 2020:
  
  As Ed says, it’s all about the amount of absorption and reflection/emission of light! When I was in Whistler mountain in Canada, the lakes all looked bright green!

Question: how is the sea blue ,but if you put it in your hand or a bucket it is clear ? it couldnt be the sky because at night when the sky is black the water is still blu???