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20.4 what? !! The guage pressure measures the pressure within the air tank. The air tank has a given volume with an amount of gas squeezed into it. That pressure only reduces as you let the gas out (unless you put the tank under enough pressure so that IT reduces in size, compressing the gas within even further). Do more training as your question is out of context and shows a lack of understanding for the basics of the subject.

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Q: Gauge pressure at depth of 20.4 is?
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A depth gauge measures the depth of an object underwater by using water pressure to determine the distance from the surface. The principle behind it is that pressure increases with depth, allowing the gauge to calculate the depth based on the pressure readings it receives.


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The gauge pressure at a depth of 100 m in water can be calculated using the formula P = ρgh, where P is pressure, ρ is density of the fluid, g is the acceleration due to gravity, and h is the depth. Assuming the density of water is 1000 kg/m^3 and taking g as 9.81 m/s^2, the gauge pressure at 100 m depth in water can be found as P = 1000 kg/m^3 * 9.81 m/s^2 * 100 m = 981,000 Pa = 981 kPa.


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