what is contraction
Contraction: Contraction is a phenomenon which involves the process or act of shortening or shrinking or decreasing in size, volume, shape , quantity or scope.
It is applied in all field whereas in science, this process is used in;
Biology ; as muscle contraction and relaxation during work which is governed by shrinking of muscular cells, contraction in heart during pimping of blood etc.
Chemistry: the size of metal decreases by making +ve ion called as contraction.
Physics; contraction is used for decrease in shaape or volume by change in temperature or presure.
This term is broad and used in all fields, as in literature, economics, geography etc.