1.当输液针刚插入瓶内时 ,有时为何会有药液冲出 ?原来当护士用针筒把药剂压入瓶子内时 ,里面空气体积变小 ,空气压强增大 ,因 p内 p0 ,所以当输液针头插入瓶口时 ,就有药液被压出来 ,速度很快 ,直至 p内 =p0 .这样一来造成了不少药液的损失 ,有经验的护士总是在压入药剂后抽 1. When the infusion needle was just inserted into the bottle, why would there be some liquid flush? When the nurse used the syringe to press the medicine into the bottle, the air volume inside the bottle became smaller and the air pressure increased, due to the p p0, Therefore, when the infusion needle is inserted into the bottle mouth, the liquid is pressed out, and the speed is very fast until p = p0. This results in a lot of liquid loss, and the experienced nurse always presses the medicine. Pumping