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Everything in physics is built off of three basic principles. Length, mass, and time. It is true in our every day life as well. How far away are you? (length). When will you be here? (time). How much is there? (mass). I know that sounds like half the conversation of a drug deal... but I promise its not. :-P
SI Units:
Length: meter (m)
Mass: kilogram (kg)
Time: second (s)