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.
The second-largest number, 13,340, worked for engineering firms. These environmental engineers earned an average salary of $84,240, with beginning salaries likely in line with the 25th or 10th percentile figures of $61,550 or $50,100, respectively. Related Reading: Engineering Salaries After Graduating School.he second-largest number, 13,340, worked for engineering firms. These environmental engineers earned an average salary of $84,240, with beginning salaries likely in line with the 25th or 10th percentile figures of $61,550 or $50,100, respectively. Related Reading: Engineering Salaries After Graduating School.