Question

What are gaugepressure,atmospheric pressure and absolute pressure at a
point 2m below the free surface of liquid having specific gravity of 1.23, if the atmospheric pressure is equivalent to 750mm of mercury?​

Answer 1

Answer:

Gauge Pressure, Absolute Pressure, and Pressure Measurement

LEARNING OBJECTIVES

By the end of this section, you will be able to:

Define gauge pressure and absolute pressure.

Understand the working of aneroid and open-tube barometers.

If you limp into a gas station with a nearly flat tire, you will notice the tire gauge on the airline reads nearly zero when you begin to fill it. In fact, if there were a gaping hole in your tire, the gauge would read zero, even though atmospheric pressure exists in the tire. Why does the gauge read zero? There is no mystery here. Tire gauges are simply designed to read zero at atmospheric pressure and positive when pressure is greater than atmospheric.

Similarly, atmospheric pressure adds to blood pressure in every part of the circulatory system. (As noted in Pascal’s Principle, the total pressure in a fluid is the sum of the pressures from different sources—here, the heart and the atmosphere.)

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