hypothesis- testable guess that can be expressed as an "if-then" statement theory - a scientific explanation that has been repeatedly confirmed matter-takes up space and has mass energy-the capacity or ability to do work
kilogram-the standard units in scientific and technical pursuits SI system -the base unit for mass in the SI system. universal law-a principle that is in effect always and everywhere.
physical science-the branch of study that includes physics and chemistry model-an artificial representation of a real system or process
A principle formed to explain things, certain phenomena, or fact which was validated previously known as Theory.
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