The actual yield is the amount of product actually obtained when a reaction is carried out. It is usually less than the theoretical yield because reactions may be incomplete, may produce side products, or may lose material during separation. The ratio of actual to theoretical yield, expressed as a percentage, gives the percent yield.

实际产量是实际进行反应时得到的产物量。它通常小于理论产量,因为反应可能不完全、可能生成副产物,或在分离过程中损失物料。实际产量与理论产量之比以百分数表示即为产率。