Consider the U-tube manometer shown in the figure. Both ends of the U-tube manometer is open to atmospheric pressure. The left and right arm of the manometer has a cross-sectional area A1 = 8 cm2 and A1 = 4 cm2, respectively. The left figure illustrates the U-tube when mercury (ρHg =13.6 g/cm3) is poured into it. The right figure shows the U-tube manometer when 90.0 g of water is poured in the right arm. (a) Determine the length of the water column in the right arm of the manometer and (b) the distance h the mercury rise in the left arm of the manometer.

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.