A clepsydra water clock is a water-based time telling contraption invented by the Ancient Greeks. Cool, right?! Find out how to make your own and get seriously geeky!
How To Make a Water Clock
Grab these materials…
1/2L clear plastic bottle
Finding the middle point of your bottle. With the help of an adult, grab your scissors and cut your bottle in two.
Take the lid off your bottle and lay it flat on a surface. Then get your drawing pin and make a small hole in the center of the lid. Get an adult to help you just in case.
Screw the lid back onto the top half of the bottle. Turn the top half of the bottle upside down and place it in the bottom half of your bottle with the lid facing the bottom.
Then add your food colouring to 500ml of water and keep your stopwatch close.
Pour your coloured water into the bottle's top half with the lid. Then time a minute and once that minute is up, take your marker and draw a line at the water level to indicate 1 minute. Then repeat and mark 2 minutes and so on.
When the water has passed through completely, your water clock is ready. Pour the water out and start again, but this time you won't need the stopwatch, just use your water clock to count the minutes. Genius!
HERE'S A TRICK
Why not decorate your water clock using permamenet markers, glitter, paint – the options are endless and so is your creativity.