science.ca Activity : Experiment

objectif

You can easily make a sechi disk to measure water turbity -- an indication of water quality in terms of its clarity.

On a besoin de...

a 20cm-diameter, 6mm-thick Plexiglas disk with a hole in the middle (this may be cut from a square sheet of Plexiglas)

metal disk with a hole in the middle (to weigh down Secchi disk)

an eyebolt with nuts and washers to fit it

rope or cord- try to avoid cotton, as it stretches

waterproof black and white paint

ce qui à faire

Instructions and materials can be found at the following places:

Carleton University Science Education Resource Centre