primary standard

简明释义

标淮原器

英英释义

例句

1.A primary standard must be a substance that can be obtained in a pure form.

主要标准必须是可以以纯净形式获得的物质。

2.In titration, a primary standard is essential for determining the concentration of a solution.

在滴定中，主要标准对于确定溶液的浓度至关重要。

3.Before starting the experiment, we need to calibrate our equipment with a primary standard.

在开始实验之前，我们需要用主要标准来校准我们的设备。

4.The laboratory uses a primary standard to ensure accurate measurements in their experiments.

实验室使用主要标准来确保实验中的测量准确。

5.Sodium chloride is often used as a primary standard due to its high purity and stability.

氯化钠常被用作主要标准，因为它具有高纯度和稳定性。

作文

In the realm of metrology, the concept of a primary standard is crucial for ensuring accuracy and reliability in measurements. A primary standard is a measurement standard that is universally accepted and can be used to calibrate other standards. It is characterized by its high degree of accuracy, stability, and reproducibility. The importance of primary standards cannot be overstated, as they serve as the foundation upon which all other measurements are built. Without a reliable primary standard, the entire system of measurement would be compromised.One of the most common examples of a primary standard is the kilogram, which was originally defined by a specific mass of platinum-iridium alloy. This physical object served as the primary standard for mass measurements worldwide. However, in recent years, the definition of the kilogram has changed to be based on fundamental constants of nature, specifically the Planck constant. This shift illustrates how science evolves, but the role of the primary standard remains vital.The process of establishing a primary standard involves rigorous testing and validation. Scientists must ensure that the standard is not only accurate but also stable over time. For instance, when developing a primary standard for temperature, researchers may use a fixed point, such as the freezing or boiling point of water under specific conditions. These fixed points provide a reliable reference that can be replicated in laboratories around the world.Another important aspect of primary standards is their role in international trade and commerce. Accurate measurements are essential for fair trade practices, and primary standards help to facilitate this. When countries agree on a primary standard, it ensures that products are measured consistently, reducing disputes and fostering trust between trading partners. This is particularly significant in industries such as pharmaceuticals, where precise measurements can have profound implications for health and safety.Moreover, the development and maintenance of primary standards require collaboration among scientists, engineers, and regulatory bodies. Organizations such as the International Bureau of Weights and Measures (BIPM) play a pivotal role in this process. They establish guidelines and protocols for the creation and use of primary standards, ensuring that they meet the highest levels of precision and reliability.In conclusion, the concept of a primary standard is fundamental to the field of measurement. It serves as the backbone of accurate and reliable data, impacting various sectors from science to commerce. As technology advances and our understanding of the universe deepens, the definitions and implementations of primary standards may continue to evolve. However, their significance will remain unchanged, as they are indispensable tools for achieving consistency and accuracy in measurements across the globe.

在计量学领域，primary standard（主要标准）的概念对于确保测量的准确性和可靠性至关重要。primary standard是一个被普遍接受的测量标准，可以用来校准其他标准。它的特点是高度的准确性、稳定性和可重复性。primary standard的重要性不容小觑，因为它们是所有其他测量的基础。如果没有可靠的primary standard，整个测量系统将会受到影响。最常见的primary standard之一是千克，最初由特定质量的铂铱合金定义。这个物理对象曾作为全球质量测量的primary standard。然而，近年来，千克的定义已改变为基于自然的基本常数，具体来说是普朗克常数。这一变化说明了科学如何发展，但primary standard的角色仍然至关重要。建立primary standard的过程涉及严格的测试和验证。科学家必须确保标准不仅准确，而且随着时间的推移保持稳定。例如，在开发温度的primary standard时，研究人员可能会使用固定点，例如在特定条件下水的冰点或沸点。这些固定点提供了一个可靠的参考，可以在世界各地的实验室中复制。primary standards的另一个重要方面是它们在国际贸易和商业中的作用。准确的测量对公平贸易实践至关重要，而primary standards有助于促进这一点。当国家就primary standard达成一致时，确保产品的一致测量，减少争议，促进交易伙伴之间的信任。这在制药等行业尤为重要，因为精确的测量可能对健康和安全产生深远的影响。此外，primary standards的开发和维护需要科学家、工程师和监管机构之间的合作。国际计量局（BIPM）等组织在此过程中发挥着关键作用。他们制定创建和使用primary standards的指南和协议，确保它们达到最高的精确度和可靠性。总之，primary standard的概念是测量领域的基础。它作为准确和可靠数据的支柱，影响着从科学到商业的各个领域。随着技术的进步和我们对宇宙的理解加深，primary standards的定义和实施可能会继续演变。然而，它们的重要性将保持不变，因为它们是实现全球测量一致性和准确性的不可或缺的工具。