what is titre

A titre, also spelled titer, is a way of expressing concentration. It is a measurement of the amount or concentration of a substance in a solution, and it can refer to the strength of a solution or the concentration of a substance in solution as determined by titration. The term "titer" has different meanings depending on the context. In immunology, a titer is a laboratory test that measures the presence and amount of antibodies in blood, which can be used to prove immunity to disease. In titration, the titer is the ratio of actual to nominal concentration of a titrant, and it is used to compensate for possible degradation of the titrant solution. In textile engineering, titre is a synonym for linear density.