💦 EASY WATER EXPERIMENT - SURFACE TENSION #shorts LABble

Day 6 of 24 of the cool science experiment advent calendar. Subscribe for a new science experiment every day.

💦 EASY WATER EXPERIMENT - SURFACE TENSION💦

Experiment
🧪Step 1 - Place a toy brick on a plate
🧪Step 2 - Place a coin ontop of the brick
🧪Step 3 - Using the dropper take water from the glass and slowly drop water beads onto the coin - ours is coloured blue so we can see the dome!
🧪Step 4 - Watch as it rises, how many many drops can you add before it spills?
🧪Step 5 - Now in the water glass add dish soap.
🧪Step 6 - Using the dropper take some of the water with the soap and drop onto the coin. What happens now?

⚗️The science
Within water the molecules that make up at liquid are in constant random motion. Intermolecular attractions pull the water molecules in all directions, however at the surface there is only pull from a lateral and downward direction. This creates a downward net force and this pulls the molecules closer together which forms a stronger layer - almost like a membrane, creating high stability. This high-load baring capacity means items like paperclips, wood and insects can glide on the water surface.

When a surfactant (soap) is added it reduces the surface tension of water, this is achieved because surfactants have two parts, a head that loves water and a tail that hates water. The water hating tails stick on the air whilst the water loving heads remain in the water forming a monolayer, this then means the membrane of surface tension that the water created before is now reduced - which is why the dome is flatter once soap is added.

📆In the calendar - Dropper

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*Not sponsored, I purchased the calendar. A small amount of commission my be made from the sale of an item.