A balloon considered spherical is 30 feet in diameter. The surrounding air is at 60 degrees Fahrenheit and the barometer reads 29.60 inches of mercury. What gross load may the balloon lift if it is filled with (a) hydrogen at 70 degrees Fahrenheit and atmospheric pressure? (b) Helium at 70 degrees Fahrenheit and atmospheric pressure

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Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.