How To Make Stainless Steel Capillary Pipette?

The inner diameter of the straw must be small. If it is large, it cannot lift the liquid inside the straw. Because of the small inner diameter, liquid molecules crawling on the inside of the tube create an upward pull that lifts a certain amount of liquid. If the inner diameter is too large, the liquid is too heavy to lift. Because the inner diameter of hair is small, the phenomenon is called capillary.

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