| Year 3 | Year 4

In STEM Club this week, the Year 3 and 4 children used pennies and water to investigate water tension.

We discovered that the bond between water molecules is strong enough to attract each other and stick together; this creates water tension. In our experiment we used pipettes, water, milk and washing up liquid to investigate whether all liquids have this ability. We predicted how many drops of liquid our penny could hold before the liquid spilled over the side. We were amazed to find out that some pennies held up to 30 drops!

Once we had experimented with the water we discovered that milk acts in a similar way. However, by adding washing up liquid to water it breaks the bonds between the molecules and so doesn’t have a strong water tension. Wow, what a lot of learning in one club!