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

Dry versus Liquid Measuring Cups

Dry vs Liquid Measuring Cups - What's The Difference?

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Dry Vs. Liquid Measuring Cups: Here's What You Need To Know

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Measuring Cup, definition, Facts, and solved examples

Measuring cup - Wikipedia

Liquid vs Dry Measuring Cups: What's The Difference?

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