Posted by poolplantcourses.org on Saturday, December 17, 2011,
In :
Did You Know...
If you've ever seen a swimming pool being emptied, you will have noticed that as the volume of water decreases, so does the 'blueness' of the water. Why is this? Well, basically, water absorbs light. You probably already know that light at wavelengths that are visible to humans is made up of the seven colours of the spectrum, ie. Red, Orange, Yellow, Green, Blue, Indigo, Violet. Water absorbs light at shorter wavelengths first, so the red gets absorbed and is therefore not visible. The blue i... Continue reading ...
