The Science Behind Vacuum Suction Cups: How They Work

From the moment we reach up and grab it to the second it sticks to another surface, have you ever thought about how a suction cup can do that without having any glue on it? It’s like sorcery but it’s really science! Suction cups are unique tools that can stick onto smooth surfaces such as windows, walls, and tiles.

When you push a suction cup against a surface, magic happens. Once applied, the suction cup expels all the air between it and the surface. It creates a unique space with zero air whatsoever. Then, all of the air surrounding that suction cup begins to push really, really hard against it, causing it to stick super tight to the surface.

Pretend the suction cup is a kind of sticker. Wet the surface well and coat it with some (soft) paste, so it will fit perfectly. If a small amount of air gets inside, the suction cup doesn't hold very well. That is why suction cups are manufactured using special materials that create a tight seal.

Suction cups can also be really useful in a lot of different situations! Here are some ways that people are using them:

How to Hang Pictures on Walls Without Making Holes

The use of soap and shampoo bottles while taking a shower

Having kitchen implements such as spatulas and measuring cups close at hand

They help plants to stand straight in pots

Holds heavier items such as mirrors and window ornaments

Some suction cups are quite small and can hold light objects. Larger suction cups have more surface area and greater diameter, allowing them to hold more weight. The design and shape of the suction cup depends on the task it is required to perform.

What exactly makes suction cups work is pretty amazing. Instead of glue or nails, they stick with the power of air pressure. When a suction cup is pressed down, it creates a small vacuum, that sticks everything, including two pieces of water, together.

Just next time you see a suction cup, remember that there’s some pretty cool science going on right in front of your face. It can glue something together without any glue whatsoever! Isn't science wonderful?