In (2) and (3), a vessel is connected to one end of the U-tube. Now the height of the mercury column serves as a means of reading the pressure inside the vessel if the atmospheric pressure is known. 這句話是甚麼意思???
為甚麼當內部壓力大於外部時，液柱將在暴露於空氣的一側更高?為甚麼當容器內部的壓力小於外部大氣壓力時，附加壓力會使液體在靠近容器的一側上達到較高水平?
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