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A little wonder, every day

A needle tip concentrates force into high pressure

A tiny tip area helps pierce fabric.

Listen to fact0:00 / —

A sewing-machine needle can pass through fabric because its narrow tip concentrates force over a very small area. That creates high pressure. There is no single universal value: pressure depends on the needle force and contact area, so the claim of 5,000 atmospheres cannot be treated as generally true without measurement conditions.