Watch a drawing of a stick person float! The whiteboard pen drawing floats because the ink is less dense than the water.
Use a dry-erase (whiteboard) marker with non-soluble ink, draw a swimming stick figure onto a smooth, shiny plate (test it on the back first to make sure it doesn’t stain the plate!). After about 10 seconds, pour water onto the plate VERY slowly (away from the drawing) – and your swimmer should lift off the plate and swim around! The drawing floats because the ink is less dense than the water.
This super easy and fun experiment for kids is from Whizz Pop Bang 84: SUPER SWIMMERS where you can find bucket-loads more science fun!