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6.5 ounces is 6.5 ounces, and 6.5 fluid ounces is 6.5 fluid ounces. But you cannot interchange the two: fluid ounces measure volume and ounces (avoirdupois) measure weight (mass).

1 fluid ounce of water weighs almost exactly 1 ounce. This is where the volumetric measure fluid ounces was derived from. For other liquids measured this way, they can vary greatly. The weight of 6.5 fluid ounces depends on the fluid's density.

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11y ago

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