The beginning of the amazing events at Krakatoa in 1883 date to May 20 when there were initial rumblings and venting from the volcano, which had been dormant for about 200 years.
A refinery margin is the revenue associated with refining petroleum, expressed as a value per volume (e.g. $/L), net of the cost of the crude oil input. The simplest refining
margin of error. Analytical technique that accounts for the number of acceptable errors in an experiment. The margin of error is put into place so that an individual can review results and then determine the level of accuracy of the experiment by taking this + or - margin of error into consideration. A smaller margin of error indicates trustworthy results and a larger margin of error means the results are not considered as accurate.