Snorkels are U-shaped tubes that allow swimmers to breath while swimming just below the surface of the water (1,028 kg/m). An average human can reduce the air pressure in their lungs by 2.53 KPa, when they extend their diaphram and expand their rib cage. Answer tolerance of ±5 on the third signficant digit. a) Calculate the maximum depth a snorkeler can swim under water, while breathing through the snorkel. Number Units The U-shaped manometer shown below has one end open to the atmosphere and the other end attached to a canister of pressurized gas. Saltwater is the liquid (p = 1,025 kg/m) in the manometer which extends a height 8.21 cm above point (3). Answer tolerance of ±5 on the third signficant digit. a) Calculate the absolute pressure of the gas in the canister. Number Units (1) ha hi (2) (3)

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Fluid Pressure

The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.

Gauge Pressure

Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.