physical quantity

简明释义

物理量

英英释义

例句

1.The volume of a gas is a physical quantity 物理量 that can change with pressure and temperature.

气体的体积是一个可以随压力和温度变化的 物理量 physical quantity。

2.Speed is a physical quantity 物理量 that describes how fast an object is moving.

速度是一个描述物体移动速度的 物理量 physical quantity。

3.Mass is another important physical quantity 物理量 in mechanics.

质量是力学中另一个重要的 物理量 physical quantity。

4.In physics, a physical quantity 物理量 can be measured and expressed numerically.

在物理学中，物理量 physical quantity 可以被测量并用数字表示。

5.Temperature is a physical quantity 物理量 that indicates how hot or cold something is.

温度是一个指示某物冷热程度的 物理量 physical quantity。

作文

In the realm of science and engineering, understanding the concept of physical quantity is crucial. A physical quantity refers to a property of a physical system that can be quantified and measured. Examples of physical quantities include mass, length, time, temperature, electric current, and many others. These quantities form the backbone of scientific measurements and experiments, allowing us to describe the world around us in precise terms.To delve deeper into the significance of physical quantities, let’s consider their role in the field of physics. Physics is fundamentally concerned with understanding how the universe operates, and this understanding is often expressed through mathematical relationships involving physical quantities. For instance, Newton's second law of motion states that force equals mass times acceleration (F = ma). Here, both mass and acceleration are physical quantities, and they directly influence the force applied to an object.Furthermore, physical quantities are categorized into two main types: scalar and vector quantities. Scalar quantities have only magnitude, such as temperature or speed, while vector quantities possess both magnitude and direction, like velocity and force. This distinction is essential for accurately describing physical phenomena. For example, when discussing the motion of a car, knowing its speed (a scalar) is not enough; we also need to know its direction (a vector) to fully understand its movement.In addition to their theoretical importance, physical quantities are vital in practical applications. Engineers and scientists rely on precise measurements of physical quantities to design structures, create new technologies, and conduct experiments. For instance, in civil engineering, the load-bearing capacity of a bridge is determined by calculating various physical quantities such as material strength, weight distribution, and environmental factors. Accurate measurements ensure safety and functionality, highlighting the real-world implications of these abstract concepts.Moreover, the measurement of physical quantities is standardized through systems such as the International System of Units (SI). This system provides a universal framework for measuring physical quantities, ensuring consistency and reliability across different fields and applications. For example, the SI unit for mass is the kilogram, while the unit for length is the meter. By adhering to these standards, scientists and engineers can communicate their findings effectively, fostering collaboration and innovation.In conclusion, the concept of physical quantity is fundamental to our understanding of the natural world. By quantifying various properties, we can formulate theories, conduct experiments, and apply our knowledge to solve real-world problems. Whether in the classroom, laboratory, or construction site, physical quantities play an indispensable role in shaping our understanding and interaction with the universe. As we continue to explore the complexities of science and technology, mastering the concept of physical quantity will remain essential for future advancements and discoveries.

在科学和工程领域，理解物理量的概念至关重要。物理量指的是可以被量化和测量的物理系统的属性。物理量的例子包括质量、长度、时间、温度、电流等。这些量构成了科学测量和实验的基础，使我们能够用精确的术语描述周围的世界。为了更深入地探讨物理量的重要性，让我们考虑它们在物理学领域中的作用。物理学根本上关注于理解宇宙如何运作，而这种理解通常通过涉及物理量的数学关系来表达。例如，牛顿第二运动定律表明，力等于质量乘以加速度（F = ma）。在这里，质量和加速度都是物理量，它们直接影响施加在物体上的力。此外，物理量分为两种主要类型：标量和矢量量。标量量只有大小，例如温度或速度，而矢量量则同时具有大小和方向，如速度和力。这一区别对于准确描述物理现象至关重要。例如，在讨论汽车的运动时，仅仅知道它的速度（一个标量）是不够的；我们还需要知道它的方向（一个矢量），才能全面理解它的运动。除了理论上的重要性，物理量在实际应用中也至关重要。工程师和科学家依赖于对物理量的精确测量来设计结构、创造新技术和进行实验。例如，在土木工程中，桥梁的承载能力是通过计算各种物理量（如材料强度、重量分布和环境因素）来确定的。准确的测量确保了安全和功能，突显了这些抽象概念的现实意义。此外，通过国际单位制（SI）等系统对物理量的测量进行标准化。该系统为测量物理量提供了一个通用框架，确保在不同领域和应用中的一致性和可靠性。例如，质量的SI单位是千克，而长度的单位是米。通过遵循这些标准，科学家和工程师可以有效地交流他们的发现，促进合作和创新。总之，物理量的概念是我们理解自然世界的基础。通过量化各种属性，我们可以制定理论、进行实验，并将我们的知识应用于解决现实问题。在课堂、实验室或建筑工地，物理量在塑造我们对宇宙的理解和互动中扮演着不可或缺的角色。随着我们继续探索科学和技术的复杂性，掌握物理量的概念将始终是未来进步和发现的关键。