by Emma Louise Oldham July 09, 2018

Have you ever heard of a diver talking about ‘feeling pressure’ when they’re underwater? This is because water is much denser than air. A volume of water 10 metres thick applies the same amount of pressure as the entire Earth’s atmosphere (which is nearly 130km thick!). So, when a diver descends 20m underwater, they would experience the same pressure as two lots of Earth’s atmosphere pushing down on them. However, you don’t have to be a diver to see how depth affects water pressure. Just by using a recycled plastic bottle, you can experience it at home with this simple activity.



What to do:

Step 1: Ensure your bottle is empty and safely remove any labels.

Step 2: Use your ruler to measure 7cm from the bottom of the bottle. Make a line with your marker.



Step 3: Now measure 20cm from the bottom of the bottle and add another line.

Step 4: Ask an adult to poke the nail or tack into each of the lines you’ve made.You only need one hole on each line.

Step 5: Cover up the two holes with tape.

Step 6: Fill up the bottle with water and secure the lid.

Step 7: Stand the bottle near the side of a sink, with the holes pointing towards it.

Step 8: Remove the tape and see what happens! Record your findings in the boxes below.

Now have a go at answering our questions:



Leave a comment

Comments will be approved before showing up.


In other Eco Kids Planet News

Monthly Competition: Forest Mud Faces
Monthly competition: forest mud faces

by Eco Kids Planet August 31, 2021

In June’s ‘Tiny Wildlife’ issue, we asked you to create forest mud faces. Thank you to all of you who embraced the messy challenge and sent us your mud-spattered entries!

A Window in the Deep
A window in the deep

by Eco Kids Planet July 13, 2021

If you could pilot a submarine, what would you see? This clever viewer features a scrolling underwater scene!

Make Your Own: Button Bugs
Make your own: button bugs

by Eco Kids Planet June 18, 2021

Use inspiration from nature to make these colourful button bugs. They are so easy to make, you will soon have a whole swarm.   What you need: Buttons in different colours and sizes Pipe cleaners Googly eyes Beads for feet/antennae Strong glue Scissors   What to do:   Step 1: Cut a pipe cleaner in...