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.
A traceability matrix is used to verify that all stated and derived requirements are allocated to system components and other deliverables (forward trace). The matrix is also used to determine the source of requirements (backward trace).Requirements traceability includes tracing to things other than software that satisfy the requirements such as capabilities, design elements, manual operations, tests, etc.EQUIREMENTS TRACEABILITY MATRIX. The purpose of the RTM is to help ensure the object of the requirements conforms to the requirements by associating each requirement with the object via the traceability matrix.