part per million

简明释义

百万分之一

英英释义

例句

1.The manufacturer must ensure that the product contains less than 1 part per million (百万分之一) of harmful chemicals.

制造商必须确保产品中有害化学物质的含量低于1 part per million (百万分之一)。

2.The soil contamination was found to have 5 part per million (百万分之一) of mercury.

土壤污染被发现含有5 part per million (百万分之一) 的汞。

3.The concentration of lead in the water was measured at 10 part per million (百万分之一).

水中铅的浓度测量为10 part per million (百万分之一)。

4.In air quality testing, a level of 400 part per million (百万分之一) of CO2 is considered high.

在空气质量测试中，400 part per million (百万分之一) 的二氧化碳水平被认为是高的。

5.The acceptable limit for arsenic in drinking water is 10 part per million (百万分之一).

饮用水中砷的可接受限值为10 part per million (百万分之一)。

作文

Understanding the concept of part per million is crucial in various scientific fields, particularly in environmental science and chemistry. The term part per million (ppm) refers to a unit of measurement that describes the concentration of one substance in a million parts of another. This measurement is commonly used to quantify the presence of pollutants in air, water, and soil. For instance, if a water sample contains 10 part per million of a certain contaminant, it means that there are 10 units of that contaminant for every one million units of water. The significance of part per million becomes evident when we consider the impact of pollutants on human health and the environment. Many harmful substances, such as heavy metals or toxic chemicals, can be present in extremely low concentrations yet still pose serious risks. For example, lead in drinking water is often measured in part per million, and even levels as low as 15 part per million can be considered unsafe for consumption. Thus, understanding ppm helps us assess the safety and quality of our resources.In addition to environmental monitoring, part per million is also widely used in industries such as pharmaceuticals and food production. In these sectors, maintaining specific concentrations of active ingredients or preservatives is essential to ensure product efficacy and safety. For instance, a medication might contain 50 mg of an active ingredient per 1,000,000 mg of the total formulation, which translates to 50 part per million. This precise measurement guarantees that patients receive the correct dosage without exceeding safe limits.Furthermore, the use of part per million extends to the field of agriculture, where it is vital for assessing soil quality and nutrient levels. Farmers often test soil samples for micronutrients like zinc or copper, which are required in small amounts but are critical for plant growth. A soil test might reveal that the concentration of zinc is 5 part per million, indicating that while the amount is minimal, it is still significant enough to influence crop yields. The ability to measure and interpret part per million concentrations allows scientists and industry professionals to make informed decisions regarding public health, environmental policies, and agricultural practices. It provides a standardized way to communicate data and findings, making it easier to compare results across different studies and regions. In conclusion, the concept of part per million is not merely a technical term; it is a vital measurement that affects many aspects of our lives. From ensuring safe drinking water to developing effective medications and promoting sustainable agriculture, understanding ppm is essential for making informed choices that safeguard our health and environment. As we continue to face challenges related to pollution and resource management, the importance of accurately measuring and interpreting part per million will only grow, highlighting the need for ongoing education and awareness in this area.

理解百万分之一的概念在多个科学领域中至关重要，特别是在环境科学和化学中。术语百万分之一（ppm）指的是一种测量单位，用于描述一种物质在另一种物质的百万部分中的浓度。这种测量通常用于量化空气、水和土壤中污染物的存在。例如，如果水样中含有10百万分之一的某种污染物，这意味着在每一百万单位的水中有10个单位的该污染物。当我们考虑污染物对人类健康和环境的影响时，百万分之一的重要性变得显而易见。许多有害物质，如重金属或毒性化学品，可能以极低的浓度存在，但仍然构成严重风险。例如，饮用水中的铅通常以百万分之一为单位进行测量，即使浓度低至15百万分之一也可能被视为不安全。因此，理解ppm有助于我们评估资源的安全性和质量。除了环境监测，百万分之一还广泛应用于制药和食品生产等行业。在这些领域，保持特定活性成分或防腐剂的浓度对于确保产品的有效性和安全性至关重要。例如，一种药物的配方中可能每1000000毫克总配方含有50毫克活性成分，这就转化为50百万分之一。这一精确测量确保患者获得正确剂量，而不会超过安全限值。此外，百万分之一的使用还扩展到农业领域，在该领域中，它对于评估土壤质量和养分水平至关重要。农民常常测试土壤样本，以检测锌或铜等微量元素，这些元素需要少量但对植物生长至关重要。土壤测试可能显示锌的浓度为5百万分之一，这表明虽然数量很小，但仍足以影响作物产量。能够测量和解释百万分之一浓度使科学家和行业专业人士能够就公共卫生、环境政策和农业实践做出明智的决策。它提供了一种标准化的方式来传达数据和发现，使得跨不同研究和地区比较结果变得更加容易。总之，百万分之一的概念不仅仅是一个技术术语；它是一种重要的测量，影响着我们生活的许多方面。从确保饮用水安全到开发有效药物以及促进可持续农业，理解ppm对于做出保护我们健康和环境的明智选择至关重要。随着我们继续面临与污染和资源管理相关的挑战，准确测量和解释百万分之一的重要性只会增加，这突显了在这一领域持续教育和意识的必要性。