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Fluid pressure is the push that a fluid—like water or air—applies to anything it touches.
Two main things affect fluid pressure: depth and density.
Imagine poking three holes at different heights in a water bottle. The bottom hole shoots water the farthest, the middle shoots less, and the top shoots the least.
Why? Because the deeper you go, the more water is stacked above, adding pressure due to its weight.
It’s like a stack of books—the one at the bottom feels the most pressure from the ones above.
That’s why you feel more pressure when diving deeper into a pool.
Now let’s look at density. Fill one bottle with freshwater and another with salty ocean water.
At the same depth, the saltwater shoots farther. That’s because saltwater is denser—it packs more particles into the same space.
So, the deeper you go or the denser the fluid, the more pressure you’ll feel.
That’s why when you dive deep in the ocean, your ears feel more pressure than in a pool—greater depth and denser saltwater add up to higher pressure.
