why is the sky blue?
part of the show forecasting weather and climate
what you need
a lemonade bottle or large glass
a large jug or a bowl and a funnel
waeter
a little milk powder
a small powerfull torch
a dark room
what to do
fill the jug with water
add the milk or milkpowder - do this very slowly as you only need a tiny amount 5-10 pinches will provably be sufficient
turn the lights off
pour 1-2 cm of liquid into the bottom of the bottle.
shine the torch up through the bottom of the bottle.
look at the light coming straight through the bottle and the light coming out of the side, what happens to the colour?
add some more liquid,and look thorough it again (repeat)
if nothing happens to the colour, you need to add a bit more milk poder, if the light doesn't get through the bottle , you need a bit less