I know,that my question is bizarre,but i m interesting for answer. To create formula,i mean,that scientist makes experiment and formula is result of it.And I have sometimes problem to understand,what physical formula means. For example:Average speed is simple to make scheme.Just speed divide by time nad that s it.But others are more complicated. Example:electric resistance is:R=specific electrical resistance·length/cross section area. I understand it but,why is not like that:R=specific electrical resistance+length−cross section area.I know,that is like calculate apples with pears,but if length will be longer,R will be higher,and if cross section area will be more extensive,R will be lower.Mathematically,it is very similar. So,and my terminal and main question is,if the creating of formula is concern of agreement.That means, a few scientists will meet,and they will make a decision about formulas. Thanks a lot,i know it s stupid question,but i would like to know it.