A 1800 N balloon is filled with 2800m^3 of hydrogen having a specific weight of 1.5 N/m^3 A. What lift does the balloon exert at the earth surface? Unit weight of air is 12.50 N/m^3. B. What lift does the balloon exert at an elevation of 8km, assuming that the volume has increased 5%? Unit weight of air is 4.50 N/m^3. C. What lift does the balloon exert at an elevation of 16km, assuming that the volume has increased 10%? Unit weight of Air is 2.50 N/m^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.