Hello, I have received your answer, thank you very much! I have one more question about helium, do I need to add this in the mass, if not why? Please kindly help me here, thanks a lot! Consider a child's balloon inflated with helium, the density of which is PHe = 0.18 kg/m3. The balloon envelope and the string have a total mass of 10g. What must be the diameter of the spherical balloon so that it floats motionless in the air of density p air = 1.27kg/m3? (Answer is 26cm)

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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.