 AD stands for ANNO DOMINI which refers to Christ's birth. BC is before Christ. CE stands for 'Common Era' and is a recent term. It is used in place of AD.   BCD stand â¦ s for 'Before Common Day' and is used instead of BC, however it is more commonly represented as BCE, 'Before Common Era'.
Chemical engineers typically do the following: 1  Conduct research to develop new and improved manufacturing processes. 2  Develop safety procedures for those working with dangerous chemicals. 3  Develop processes for separating components of liquids and gases, or for generating electrical currents, by using controlled chemical processes.
Although there is overlap between chemistry and chemical engineering, the courses you take, degrees, and jobs are quite different. Here's a look at what chemists and chemical engineers study and what they do. The big difference between chemistry and chemical engineering has to do with originality and scale. Chemists are more likely to develop novel materials and processes, while chemical engineers are more likely to take these materials and processes and upscale them to make them larger or more efficient.