A crystal or crystalline solid is a solid material whose constituents, such as atoms, molecules or ions, are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.nhedral crystals do not, usually because the crystal is one grain in a polycrystalline solid. The flat faces (also called facets) of a euhedral crystal are oriented in a specific way relative to the underlying atomic arrangement of the crystal: They are planes of relatively low Miller index.
Answer Wiki. Actually, in modern warfare, tracers are not used as they were during previous wars. They were originally used to allow gunners to track where their small caliber bullets were actually going. However since their ballistics were quite different than the standard rounds, they only gave a rough estimate for targeting.
How Radar Detectors Work Radar detectors are small devices that help identify the presence of radars, such as those used by police to locate cars driving over the speed-limit. Certain types of radar detectors also identify the presence of laser-speed guns, which may be useful for those looking to avoid speed traps that traditional radar detectors may miss. In order to understand how exactly a radar detector works, itâs helpful to understand the manner in which basic radars operate.