The dynamics of a system of hard spheres enclosed between two parallel plates separated a distance smaller than two particle diameters is described at the level of kinetic theory. The interest focuses on the behavior of the quasi-two-dimensional fluid seen when looking at the system from above or below. In the first part. a collisional model for the effective two-dimensional dynamics ... https://thegreensjunglebeautyshops.shop/product-category/cap/