Viscous gas

[Breezer]

Hi all,

I recently read in the MSC.Dytran users guide:

Euler with shear strength used to model
- Solids with large deformation
- Viscous fluids
- Viscous gases

Ok, a gas can exert a tangential (shearing) force on a surface, which acts like friction between solid surfaces. This "sticky" property of gases is called the viscosity. But seriously, can someone give me some examples of a highly viscous = “sticky” gas? When would I take shear strength of a gas into account except in aerodynamics?

Thanks,
A