U-tube Manometer with equal & unequal limb types

This is the most simple and precise device used for the measurement of pressure. It consists of a transparent tube constructed in the form of an elongated 'U', and partially filled with the manometeric fluid such as mercury. The purpose of using mercury as the manometeric fluid is that their specific gravity at various temperatures are known exactly and they dont stick to the tube. The two common types of manometers are the equal limb type and unequal limb type. Operation of Manometer : To measure the pressure of a fluid which is less dense and immersible with the manometeric