percentage by weight

简明释义

重量百分比

英英释义

例句

1.To comply with safety regulations, the percentage by weight of hazardous materials must be reported.

为了遵守安全规定，必须报告危险材料的按重量百分比。

2.In chemistry, the concentration of a solution is often expressed as percentage by weight.

在化学中，溶液的浓度通常以按重量百分比表示。

3.When formulating cosmetics, companies must specify the active ingredients' percentage by weight on the label.

在配制化妆品时，公司必须在标签上说明活性成分的按重量百分比。

4.The recipe calls for a sugar content of percentage by weight to ensure the cake is sweet enough.

这个食谱要求糖的含量为按重量百分比，以确保蛋糕足够甜。

5.The nutritional information on food packaging often includes fat content as a percentage by weight.

食品包装上的营养信息通常将脂肪含量作为按重量百分比列出。

作文

Understanding the concept of percentage by weight is crucial in various fields, including chemistry, cooking, and manufacturing. This term refers to the concentration of a particular substance within a mixture, expressed as a percentage of the total weight of that mixture. For instance, if you are making a solution and you have 10 grams of salt dissolved in 90 grams of water, the percentage by weight of salt in the solution would be calculated as follows: (10 grams of salt / (10 grams of salt + 90 grams of water)) * 100 = 10%. This means that salt constitutes 10% of the total weight of the solution.In chemistry, understanding percentage by weight is essential for preparing solutions with precise concentrations. For example, when a chemist needs to create a 5% saline solution, they must accurately measure the amount of salt relative to the total weight of the solution. This ensures that experiments yield reliable results, as even small deviations in concentration can lead to significant differences in chemical reactions.Cooking is another area where percentage by weight plays a vital role. Professional chefs often rely on this measurement to ensure consistency in their recipes. For instance, when baking bread, the ratio of flour to water is crucial for achieving the desired texture and flavor. If a recipe calls for a hydration level of 65%, this means that the weight of the water should be 65% of the weight of the flour used. Therefore, if a baker uses 1,000 grams of flour, they should use 650 grams of water to maintain the proper percentage by weight.In the manufacturing industry, especially in the production of materials like plastics or alloys, the percentage by weight of each component is critical for ensuring the final product meets specific performance standards. For example, in creating a composite material, engineers must determine the optimal percentage by weight of each ingredient to achieve the desired strength and flexibility. If the ratios are not correct, the material may fail to perform as expected, leading to costly errors and safety concerns.Moreover, in the field of nutrition, understanding percentage by weight can help consumers make informed choices about their diets. Food labels often provide information on the percentage by weight of various nutrients, allowing individuals to assess the nutritional value of different products. For instance, if a food item contains 20% protein by weight, it indicates that 20 grams of protein are present in every 100 grams of that food. This information can guide people in selecting foods that align with their dietary goals, whether they aim to increase protein intake or reduce fat consumption.In conclusion, the concept of percentage by weight is a fundamental principle that applies across various disciplines. Whether in the laboratory, kitchen, manufacturing floor, or grocery store, understanding this measurement enables individuals and professionals to make accurate calculations and informed decisions. Mastering the percentage by weight concept not only enhances precision in scientific endeavors but also contributes to better cooking practices, improved product quality, and healthier dietary choices. Therefore, it is essential to grasp this idea thoroughly to apply it effectively in real-world scenarios.

理解按重量百分比的概念在化学、烹饪和制造等多个领域中至关重要。这个术语指的是特定物质在混合物中的浓度，以该混合物的总重量的百分比表示。例如，如果你制作一种溶液，10克盐溶解在90克水中，那么盐在溶液中的按重量百分比将计算如下：(10克盐 / (10克盐 + 90克水)) * 100 = 10%。这意味着盐占溶液总重量的10%。在化学中，理解按重量百分比对于准备具有精确浓度的溶液至关重要。例如，当化学家需要创建5%的盐水溶液时，他们必须准确测量盐的数量相对于溶液的总重量。这确保实验产生可靠的结果，因为即使是小的浓度偏差也会导致化学反应中显著的差异。烹饪是另一个按重量百分比发挥重要作用的领域。专业厨师经常依赖这种测量来确保他们食谱的一致性。例如，在烘焙面包时，面粉与水的比例对达到所需的质地和风味至关重要。如果一个食谱要求65%的水合水平，这意味着水的重量应该是所用面粉重量的65%。因此，如果面包师使用1000克面粉，他们应该使用650克水以保持适当的按重量百分比。在制造业中，尤其是在塑料或合金等材料的生产中，各成分的按重量百分比对于确保最终产品满足特定性能标准至关重要。例如，在创建复合材料时，工程师必须确定每种成分的最佳按重量百分比以实现所需的强度和灵活性。如果比例不正确，材料可能无法按预期表现，从而导致昂贵的错误和安全隐患。此外，在营养领域，理解按重量百分比可以帮助消费者做出明智的饮食选择。食品标签通常提供各种营养素的按重量百分比信息，使个人能够评估不同产品的营养价值。例如，如果某种食品的蛋白质含量为20%（按重量计算），这表明每100克该食品中含有20克蛋白质。这些信息可以指导人们选择符合其饮食目标的食品，无论他们是希望增加蛋白质摄入还是减少脂肪消费。总之，按重量百分比的概念是一个基本原则，适用于多个学科。无论是在实验室、厨房、制造车间还是杂货店，理解这一测量使个人和专业人士能够进行准确的计算和明智的决策。掌握按重量百分比的概念不仅增强了科学工作的精确性，还促进了更好的烹饪实践、提高了产品质量以及更健康的饮食选择。因此，全面掌握这一理念对于在现实场景中有效应用至关重要。