Why are there Dry and Liquid Measuring Cups? What's the difference?

Why are there Dry and Liquid Measuring Cups? What's the difference?

I am going out on a limb here and estimating that at least 4 out of every 10 homes now only has 1 set of measuring cups.  And this one set is used to measure

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What's the Difference Between Dry and Liquid Measurements?

What's the Difference Between Dry and Liquid Measurements?

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