In which field would a refractometer commonly be used?

A refractometer is an instrument specifically designed to measure the refractive index of substances, which is particularly useful in chemistry. In this field, refractometers help determine the concentration of solutes in a solution by measuring how much light is bent when it passes through it. This measurement is critical in various chemical processes, including quality control in laboratories and industries, where precise concentrations of solutions are essential for reactions and other applications.

In addition to chemistry, refractometers are occasionally used in other fields such as botany, where they may assist in measuring the sugar concentration in plant sap to assess plant health. However, the primary and most common application of refractometers remains in chemistry due to its direct relevance to chemical properties and processes.