Any Math Studs Out There?

will someone please explain how to solve this problem

there are 8 silver coins and one counterfeit coin that looks like a silver coin but actually weighs slightly less than the others.
by using a balance scale to compare coins (or groups of coins), how can you determine the counterfeit coin with just 2 weighings???

i shall give the first person to solve and explain the answer, best answer!

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