What is the difference between yield and productivity?
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The products of coking plants, such as coal tar and crude benzene, involve concepts like yield. Taking crude benzene as an example, 100 tons of coal produce 0.85 tons of crude benzene; thus the yield for crude benzene is calculated as 1.2÷100×100% = 0.85%, which represents the percentage of crude benzene produced relative to the amount of coal used. It can also be calculated in another way: if 100 tons of coke are produced along with 0.98 tons of crude benzene, then 0.98÷100×100% = 0.98%, representing the percentage of crude benzene produced relative to the amount of coke produced. Some experts say that the yield of crude benzene is equal to the output of crude benzene divided by the output of coke. Other books state that the yield of crude benzene is equal to the actual output of crude benzene divided by the theoretical output of crude benzene multiplied by 100%. Which of these statements is correct?
The yield of crude benzene in coking plants is usually expressed as a percentage, representing the ratio of the crude benzene produced to the amount of raw coal used, or to the amount of coke produced. For example, using 100 tons of coal or coke to produce 0.85 tons or 0.98 tons of crude benzene, the yields are 0.85% and 0.98%, respectively. The yield of crude benzene is the ratio between the actual amount of crude benzene produced and the amount that should be produced theoretically, expressed as a percentage. This reflects the efficiency of the production process. Therefore, the correct statement is: – The yield of crude benzene is the ratio of the output of crude benzene to the consumption of raw materials (coal or coke). - The yield of crude benzene is the ratio of the actual production of crude benzene to its theoretical production. The above two definitions distinguish between the concepts and calculation methods of yield and productivity. .
How much material is extracted from underground by an oil field determines its productivity； The yield of crude oil after dehydration of the extracted material is the result.