A scientific theory is a well-substantiated explanation of some aspect of the natural world that is acquired through the scientific method and repeatedly tested and confirmed, preferably using a written, pre-defined, protocol of observations and experiments.
Process Engineer Salary. A Process Engineer earns an average salary of $70,876 per year. A skill in Simulation is associated with high pay for this job. Most people move on to other jobs if they have more than 20 years' experience in this field. $52,970 - $97,247.
Starting Salary Compared to Other Engineers. Petroleum engineers with bachelor's degrees earn more in starting salaries than other engineers by far. Compared to the next engineer on the NACE starting salary list, the chemical engineer at $64,902, the petroleum engineer starting salary of $83,121 is 25 percent higher.hird on the list is the mining and minerals engineer with a starting salary of $64,404. With the highest starting salary out of the gate, petroleum engineers tend to make the most of all engineers during their working years.