How can you Compare how Effective the Antibiotics was, on the Practical of Testing the Action of Antibiotics?

-Simply by Looking at their Clear Zones can give you a Idea how, Bigger = More Effective -If its Hard to use Visual, then get the Area of the Clear Zone by using the Formula of a Circle, because the Clear Zone is a Clear Zone. -Remember, Measure from the BOTTOM of the Petri Dish because you have Microbes that may be Dangerous.