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

4 pieces plastic measuring cups have 4 different sizes from small to big, include: 4 cups, 2-1/2 cups, 1-1/2 cups, and 3/4 cup. You can use these

Plastic Measuring Cups Set With 4 Different Sizes - Measuring Cup for Dry and Liquid Ingredients Stackable and Clear Measuring Cups Plastic - Liquid

How Many Ounces in a Cup (Dry and Liquid Measurements) ⋆ 100 Days of Real Food

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Deal of the Day Cooking Tools And Ingredients From Above. Baking Concept With Measuring Spoons, Wooden Scoops, Whisks, Cookie Cutters, Sugar, Flour, Eggs And Cinnamon On A Modern Concrete Background With Copy

Dry versus Liquid Measuring Cups - Crazy for Crust

How Many Ounces In A Cup - Dry-Wet-Imperial-Metric

Dry versus Liquid Measuring Cups

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

What's the Difference Between Dry and Liquid Measurements?

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