Why is a Cup of Coffee 6 Ounces?

In America, when you read about serving sizes, 8 oz. seems to be the standard when it comes to drinks. At first glance, that makes sense. After all, 8 oz. is a cup. Then you realize that 6 oz. is actually the standard for coffee.

Squared ceramic cup (6 oz) in off-white glazes- bathroom cup- handleless mug, or for sake, wine mug, juice, tea or coffee

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