In the scientific world, cold hard facts are often termed

laws are your answer.

For example, "The law of gravity" says that whatever has more mass than air would be pushed downward, while those with less would be pushed upwards by the air.

Theory's on the other hand, are yet to be proven, but are generally accepted (such as the Theory of Evolution)

hope this helps

multiplying and dividing the two decimals and the eqations by the same number of the overalls