A Bourdon gage (see Fig. 2.13 and Video V2.4) is oftenused to measure pressure. One way

Chapter 2, Problem 2.70

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A Bourdon gage (see Fig. 2.13 and Video V2.4) is oftenused to measure pressure. One way to calibrate this type of gageis to use the arrangement shown in Fig. P2.70a. The container isfilled with a liquid and a weight, , placed on one side with thegage on the other side. The weight acting on the liquid through a0.4-in.-diameter opening creates a pressure that is transmitted tothe gage. This arrangement, with a series of weights, can be usedto determine what a change in the dial movement, , in Fig. P2.70b,corresponds to in terms of a change in pressure. For a particulargage, some data are given below. Based on a plot of these data,determine the relationship between and the pressure, p, where pis measured in psi. (lb) 0 1.04 2.00 3.23 4.05 5.24 6.31 (deg.) 0 20 40 60 80 100 120