Viscosity Gas

satellite view of weather pattern in vicinity of robinson crusoe islands on 15 september 1999, shows unique turbulent cloud pattern called kármán vortex street

viscosity, physical property, measure of how adjacent molecules stick 1 another. solid can withstand shearing force due strength of these sticky intermolecular forces. fluid continuously deform when subjected similar load. while gas has lower value of viscosity liquid, still observable property. if gases had no viscosity, not stick surface of wing , form boundary layer. study of delta wing in schlieren image reveals gas particles stick 1 (see boundary layer section).