Absorbance - the fraction of light absorbed by the sample

Colorimeter - an instrument used to measure the amount of light absorbed by a sample when a beam of light passes through the sample

Data-logger interface - a device used to measure the change of a particular variable over time

Instantaneous rate - the slope of the tangent to a concentration-time curve at a particular time t

Light transmittance - the amount of light passing through a sample

Pressure sensor - a device used to measure the pressure

Quench - the process of stopping a reaction

Titrimetric analysis - a process that found the concentration of substanes by titrimetric methods