mean free path

简明释义

平均自由程

英英释义

例句

1.Understanding the mean free path is essential for predicting gas behavior in various conditions.

理解平均自由程对于预测气体在各种条件下的行为至关重要。

2.When pressure increases, the mean free path of gas molecules decreases.

当压力增加时，气体分子的平均自由程会减少。

3.In plasma physics, the mean free path helps us understand particle interactions.

在等离子体物理中，平均自由程帮助我们理解粒子之间的相互作用。

4.In a gas, the average distance a molecule travels before colliding with another is called the mean free path.

在气体中，一个分子在与另一个分子碰撞之前的平均行进距离被称为平均自由程。

5.The mean free path of air molecules at room temperature is approximately 68 nanometers.

室温下空气分子的平均自由程大约为68纳米。

作文

The concept of mean free path is fundamental in the field of physics, particularly in the study of gases and their behaviors. In essence, the mean free path refers to the average distance that a particle travels between successive collisions with other particles. This concept is crucial for understanding various phenomena, such as diffusion, thermal conductivity, and even the behavior of gases under different conditions.To illustrate the importance of mean free path, consider a gas composed of a large number of molecules moving randomly. As these molecules travel through space, they will occasionally collide with one another. The distance a molecule can travel before it collides with another molecule is what we define as its mean free path. Factors such as temperature, pressure, and the size of the molecules all influence this average distance. For instance, at higher temperatures, molecules move more rapidly, which can lead to an increased frequency of collisions, thereby reducing the mean free path.Understanding the mean free path is essential not only in theoretical physics but also in practical applications. For example, in the field of aerodynamics, engineers must consider the mean free path when designing vehicles that travel at high speeds. At such speeds, the air behaves differently than it would under normal conditions. The mean free path becomes significant because the interactions between air molecules can greatly affect drag forces acting on the vehicle.Moreover, the mean free path is also relevant in the study of radiation. When photons pass through a medium, they can be absorbed or scattered by particles within that medium. The average distance that a photon travels before interacting with a particle is again described by the mean free path. This understanding is crucial in fields such as astrophysics, where light from distant stars may pass through various interstellar mediums before reaching Earth.In summary, the mean free path is a vital concept that helps us understand the behavior of particles in a gas and their interactions with one another. It provides insights into various scientific principles and has practical implications in multiple fields, including engineering and astrophysics. By grasping the significance of the mean free path, we can better appreciate the complexities of the physical world around us and the underlying mechanisms that govern it.

“平均自由程”这一概念在物理学领域中至关重要，尤其是在气体及其行为的研究中。本质上，“平均自由程”指的是粒子在与其他粒子连续碰撞之间所能旅行的平均距离。这个概念对于理解各种现象，如扩散、热导率，甚至在不同条件下气体的行为都至关重要。为了说明“平均自由程”的重要性，考虑一个由大量分子随机运动组成的气体。当这些分子在空间中移动时，它们会偶尔相互碰撞。一个分子在与另一个分子碰撞之前能够行驶的距离就是我们定义的“平均自由程”。温度、压力和分子的大小等因素都会影响这一平均距离。例如，在较高温度下，分子运动得更快，这可能导致碰撞频率增加，从而减少“平均自由程”。理解“平均自由程”不仅在理论物理中至关重要，而且在实际应用中也不可或缺。例如，在空气动力学领域，工程师在设计高速行驶的车辆时必须考虑“平均自由程”。在这种速度下，空气的行为与正常条件下大相径庭。“平均自由程”变得尤为重要，因为空气分子之间的相互作用会极大地影响作用于车辆的阻力。此外，“平均自由程”在辐射研究中也很相关。当光子穿过某种介质时，它们可能会被该介质中的粒子吸收或散射。光子在与粒子相互作用之前所能行驶的平均距离再次由“平均自由程”来描述。这一理解在天体物理学等领域至关重要，因为来自遥远恒星的光可能在到达地球之前穿过各种星际介质。总之，“平均自由程”是一个重要的概念，帮助我们理解气体中粒子的行为及其相互作用。它为各种科学原理提供了深入的见解，并在多个领域（包括工程和天体物理学）具有实际意义。通过掌握“平均自由程”的重要性，我们可以更好地欣赏周围物理世界的复杂性及其背后支配的机制。