Laboratory experiments are being conducted using many opaque, saltwater tanks. Straight glass tubes (with a 0.25 cm inside diameter mounted on the tanks) are proposed to track the depth of the saltwater during the experiment. Determine the measurement error (in cm) resulting from the use of the tubes if the saltwater has a surface tension that is 20 percent greater than freshwater and the contact angle is 30°. (Assume the saltwater has a specific gravity of 1 .03 and a temperature of 35°C.)