Ions are subject to two main forces, diffusion and electrostatic repulsion. The basis for this term is the electrostatic repulsion between protons. The stability of milk is largely due to the electrostatic repulsion of casein micelles. This accelerating expansion effect is sometimes labeled "gravitational repulsion". This rule deals with reducing the repulsion between electrons. Work (energy) is required to bring charged protons together against their electric repulsion. The attraction between the N and O atoms is greater than the onium head repulsion. Here Ryden explores the line between attraction and repulsion to kitsch. Lightning is also able to fly by generating a localized electromagnetic repulsion field. This causes their entropy to decrease and leads to a repulsion. A force-directed graph can involve forces other than mechanical springs and electrical repulsion. Lithography works because of the mutual repulsion of oil and water. The best geometry to reduce the repulsion is a tetrahedral shape. The Repulsion (jumping) and Propulsion (running) gels in "Portal 2" originated in "". Roman Polanski's film, "Repulsion" (1965) was partly filmed in South Kensington.