What Is a Dry Ounce?
A dry ounce or ounce refers to a measure of weight in the Avoirdupois system, which is the standard in the United States. The system originated in the United Kingdom.
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Weight
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In the United States, vendors typically sell most goods by Avoirdupois weight. Metric weight, which is based on the gram, represents the standard in many other countries. One ounce equals about 28.35 grams.
Volume versus Weight
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The fluid, or liquid, ounce represents a measurement of volume, not weight. According to PastryItems.com, a liquid ounce does not equal a dry ounce, and no standard of conversion exists between dry and liquid measures.
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Dry versus Liquid Ounces
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On rare occasions, a dry ounce will equal a liquid ounce, but that occurs only by coincidence. The two measurements are not interchangeable. For example, 8 fluid ounces or a cup of butter equals a 8 dry ounces, but a cup of honey weighs 12 ounces, according to PastryItems.com.
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