The characteristic length of the space shuttle is 29 meters and the mean free path of molecules is about 10 meters. Which one of these is true? a)The continuum fluid mechanics is valid but we can not determine fluid properties there b)The fluid properties can not be determined due to high value of mean free path c)The fluid properties can be determined by using continuum approach d)Since molecular theory is valid there, we can determine the properties of the system e)None

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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.