Colorimetry is the field of determining the concentration of a coloured compound in a solution. A colorimeter, also known as a filter photometer, is an analytical machine that acts as the tool ...

The principles of colour perception, explained in terms of the interactions between a light source, an object and an observer. Fundamental aspects of light sources. The ways in which an object ...

Having immediate access to clean freshwater is often taken for granted. The different stages of treatment that raw water from streams, rivers and lakes experiences to make sure a plentiful supply of ...