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Water doesn't come out because the water cannot be replaced by air when the water is squeezed out. This is because the water would spill out, but air pressure is in the way If the hole at the end of the dropper was bigger, then the water could spill out. That is why the water spills out when you pour a drink for yourself. The water spills out , and at the same time air is spilling into the bottle.

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10y ago
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5mo ago

A dropper works on the principle of air pressure. When you press the dropper, you decrease the pressure inside the dropper, creating a vacuum that pulls the liquid in. Without pressing the dropper, the pressure inside and outside remains equal, so the liquid stays inside due to surface tension and gravity.

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Q: Why does not liquid run out of dropper unless pressed?
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