Sometimes after a long period of sunshine, we might get some heavy rainfall and get soaked to the skin! Have you ever wondered why this happens? The answer is precipitation! This is where the heat of the sun evaporates the moisture below it into a vapour, these vapours then cool off and change back into a liquid, this is called condensation.
Once enough condensation accumulates, the air and clouds can’t hold its weight any longer and this falls from the sky in the form of precipitation (rain to you and me!). All of this happens because there is only a limited amount of water on the planet which moves around in something called a water cycle.
We’re going to show you a cool experiment that demonstrates this perfectly by creating your very own water cycle bag!
What you’ll need:
- Ziploc bag
- Permanent marker
- Some water
- Food colouring (you can choose your own!)
- Sticky tape
How to the water cycle bag:
- Draw a design of your choice on the Ziploc bag (sun, clouds etc.!).
- Add water to the bag.
- Put in a few drops of the food colouring.
- Seal the Ziploc bag, ensuring it is airtight.
- Tape your water cycle bag to a window and let the sunshine heat it up.
- Observe the rain forming inside the water cycle bag!