Amaze Your Kids with the Floating Paperclip Trick! Create Magic at Home!

Sometimes science can seem a little bit magical, so why not amaze your children with this nifty trick before teaching them the science behind it. Experiments like the floating paperclips helps children develop an interest in science.

Let your kids’ jaws drop to the floor as you make a paper clip float on water and discover the laws of surface tension with this easy and exciting science experiment. Your floating paper clip could inspire a whirlwind of learning and exploration into the wonderful world of science. Check out more here.

What You’ll Need

You will need:

A paperclip (or a few)
Kitchen Roll
A bowl of water
A cotton bud or a pencil with a rubber on the end
Optional: baby powder or laundry detergent

Setting Up Floating Paperclip Experiment

To really WOW your kids, you should get them to try and make their own paperclips float first. They will drop them into the water and see them sink to the bottom rendering it impossible for you to do. Then you can shock them with the simple use of your kitchen roll to help you out:

1. Fill your bowl about 3/4 full of water

2. Next, place a small square of tissue paper on the surface of the water, trying to make sure that you place it down evenly do the tissue itself doesn’t sink.

3. Once your tissue is floating, place your paper clip on the tissue trying to touch the water or the tissue with your fingers.

4. Then if your paperclip is sitting happily on top of your kitchen roll (it may take a couple of tries) then you can use your cotton bud or the rubber end of the pencil to push the piece of tissue away from underneath the paperclip and then you should have your very own floating paper clip!

Image © Armin Kübelbeck

The Sciency Bit for the floating paperclip

So how does it work?

Well, this all comes down to the idea of surface tension. Water molecules are packed very tightly together, and being a liquid the molecules are highly adaptable to shape.

Surface tension is the idea of a ‘skin’ being created on the surface of the water where the molecules pack tightly together to hold what is floating on top of it, so given the right push, the skin of the water can pack tightly enough to hold up the weight of the paper clip; giving it the illusion of floating.

Image © Robert D. Anderson

Add Some More Fun for the Floating Paperclip

There are lots of things you can do to make this more of a science experiment and engage your children with scientific thinking.

1. Try adding some detergent or baby powder to your water – does your paperclip sink? and if so, why? The detergent may interfere with the surface tension of the water by acting as a ‘surfactant’ so your paperclip may not float as easily.

2. What about if you change the shape of the paper clip?

3. Float paper instead of tissue and see if that changes the experiment.

4. How many paper clips can the surface tension hold?

Recording Your Results For The Floating Paperclip

It is always fun to record the results of your experiments and helps children learn about the importance of theories and the experiments that prove them. Why not create a table of all the different ways you try to float the paperclip so that you can compare your results at the end?

Sources

https://boundlessbrilliance.org/brilliant-blog/floatingpaperclips

https://www.physics.upenn.edu/demolab/manumech/ms19.html

https://www.teachengineering.org/activities/view/usf_surfactants_act3

FAQs for the Floating Paperclip

How does the floating paper clip trick work?

The floating paper clip trick works due to the surface tension of water. The surface of the water has a certain level of tension that acts like a thin, invisible film. This effect is caused by the molecules in the liquid being attracted to one another, creating a ‘skin’ at the surface that can hold lightweight objects that do not break the surface layer.

How do you make a floating paper clip?

It’s not actually the paperclip floating by itself, as it is denser than water. Instead, it’s the surface tension that allows it to sit on the surface without sinking. The cohesive forces between liquid molecules create a phenomenon where they can support small objects, like a paperclip, as long as the object doesn’t break the surface tension.

What causes a paperclip to float on water?

A piece of paper floats on water mainly because it’s flat, and it tends to have a lower density than water when not saturated. This allows the paper to spread out the force of gravity across a wider area. Additionally, if the paper doesn’t absorb water immediately, the surface tension keeps it afloat for a temporary period.

Remember, if you change the surface tension, for example by adding soap to the water, these objects may no longer float because the soap decreases the water’s surface tension. Always maintain a gentle touch while performing the floating paper clip trick – too much force added to the paperclip will make it sink.