I did a simple demonstration to prove the idea is functional.
Equipment and process：
baking paper folded up to a box and a hole punched at the bottom.
a straw get through the hole and fit exactly.
Pour the water into the box and let the water level over the top of the straw.
The aim is to see that the water would stop flowing through the straw when the water level reach the straw top. Which prove that I can use the idea to control the liquid volume of each dose.
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