Physical evidence is any and all objects that can establish that a crime has been committed or can provide a link between a crime and its victim or perpetrator. ... Physical evidence aids in the solution of a case, provides an element of the crime, such as fear or force, and proves a theory in the case.
An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An endothermic process absorbs heat and cools the surroundings.
