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在学完《液体的压强计算》一节后,学生提出这样一个问题:由液体压强公式p=ρgh可知,液体压强的大小随深度的增加而增大.当静脉输液时,药液越来越少,h在减小,因而液体产生的压强也在减小,为什么静脉滴注的速度却不变呢?为了弄清这个问题,我们先来研究一下插入倒置药液瓶中的塑料针头的结构.看似一根针头,其实内部有两个通道,一个通道用于向瓶内进空气,另一通道用于向外输液,且两个通道
After completing the “Liquid Pressure Computation” section, the students asked the question: The liquid pressure formula, p=ρgh, shows that the liquid pressure increases with depth. When intravenous fluids are used, there are fewer and fewer liquids. , h is decreasing, so the pressure generated by the liquid is also reduced, why the speed of intravenous drip is not changed? In order to clarify this issue, let us first study the structure of the plastic needle inserted into the inverted liquid bottle. Looks like a needle, in fact there are two channels inside, one channel for air into the bottle, another channel for infusion, and two channels