Random close pack crystal lattices have maximum densities equal to this upper limit. Random close packing does not have a precise geometric definition. It is defined statistically, and results are empirical. A container is randomly filled with objects, and then the container is shaken or tapped until the objects do not compact any further, at this point the packing state is RCP. The definition of packing fraction can be given as: "the volume taken by number of particles in a given space of volume". In other words, packing fraction defines the packing density. It has been shown that the filling fraction increases with
Packing for Mars several years working as a freelance copy editor and investigating unpopular topics. Roach explores lots of questions such as what happens after we die, what sex is all about, and what secrets human cadavers hold. However, in "Packing for Mars", she turns her mind toward space and examines the logistics of space travel. In an interview, she describes her book to be about all the surreal physical and physiological challenges of living in space as a human being. Roach explains that in addition to these problems, human beings are not in the slightest equipped or prepared to confront these challenges.