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 division of an Australian hospital shows how radioactive tracers are used in medicine. Visit this site and explain how radioactivity has led to advances in modern medicine. Smoke Detectors and Americium. This site explains how smoke detectors use radioactive elements.Visit this site and explain why it is essential to have radioactive elements in certain smoke detectors.adiocarbon Dating Radiocarbon dating can determine the age of different materials. Visit this site and explain how we know the age of something after dating it with radiocarbon.