…the property (displayed by solutions of some compounds, notably many sugars) of rotating the plane of polarization of plane-polarized light…
…an animal or human activity that seems inappropriate, such as head-scratching when confused, considered to arise unconsciously when a conflict between antagonistic urges cannot be resolved…
…a thermodynamic quantity representing the effective concentration of a particular component in a solution or other system, equal to its concentration multiplied by an activity coefficient…
