What does „Specific Rotation“ mean?
Some materials like quartz, sucrose solutions or organic compounds are able to rotate the direction of oscillation of polarized light around a determined angle. They are called optically active and can be dextrorotatory or levorotatory.
The specific rotation is a substance-specific physical parameter, which can be determined by a polarimeter. It depends on the temperature and the wavelength of the light. For some samples this value depends on the concentration as well.