linear expansion

简明释义

线膨胀

英英释义

例句

1.Engineers must account for linear expansion when designing bridges to ensure structural integrity.

工程师在设计桥梁时必须考虑 线性膨胀，以确保结构的完整性。

2.When metal rods are heated, they will undergo linear expansion, increasing in length.

当金属杆被加热时，它们会经历 线性膨胀，长度会增加。

3.The concept of linear expansion is crucial in understanding how materials behave when heated.

理解材料在加热时的行为，线性膨胀 的概念至关重要。

4.In thermodynamics, linear expansion is an important factor in the behavior of gases and liquids.

在热力学中，线性膨胀 是气体和液体行为的重要因素。

5.The formula for linear expansion can be used to calculate how much a material will expand with temperature changes.

可以使用 线性膨胀 的公式来计算材料在温度变化时会膨胀多少。

作文

When we think about the physical properties of materials, one important phenomenon comes to mind: linear expansion. This term refers to the way in which materials expand in length when they are heated. It is a fundamental concept in physics and engineering, as it affects how structures behave under temperature variations. For instance, when a metal rod is heated, it does not just expand; it expands uniformly along its length. This is described mathematically by the formula: ΔL = αL0ΔT, where ΔL is the change in length, L0 is the original length, ΔT is the change in temperature, and α is the coefficient of linear expansion for the material. Understanding linear expansion is crucial for engineers who design bridges, railways, and buildings, as they must account for the expansion and contraction of materials to prevent structural failure.In everyday life, we encounter linear expansion more often than we realize. For example, have you ever noticed how the metal lid of a jar becomes easier to open after running it under hot water? This happens because the heat causes the metal to expand, making the lid slightly larger and thus easier to remove from the glass jar. Similarly, when you walk on a hot pavement, the materials used in the construction of the road expand due to the heat from the sun. If the pavement was not designed with linear expansion in mind, it could buckle or crack under the stress of expansion.The implications of linear expansion extend beyond just physical structures. In the field of thermodynamics, understanding how materials expand can lead to innovations in various technologies. For instance, the design of thermostats relies on the principles of linear expansion. A bimetallic strip, which consists of two different metals bonded together, bends when heated due to the differing rates of linear expansion of the two metals. This bending motion can be used to open or close electrical circuits, effectively regulating temperature in heating systems.Moreover, linear expansion plays a significant role in the manufacturing process. When creating precision instruments, manufacturers must consider how temperature changes will affect the dimensions of their products. For example, if a part is machined at a certain temperature, it may not fit correctly if the ambient temperature rises significantly after production. Therefore, understanding and accounting for linear expansion is vital in ensuring that parts fit together properly under varying conditions.In conclusion, linear expansion is a critical concept that impacts many aspects of our lives, from the infrastructure we rely on to the technologies we use daily. By grasping the principles behind linear expansion, we can better appreciate the intricacies of engineering and physics. It is essential for students and professionals alike to understand this phenomenon, as it lays the groundwork for advancements in science and technology. As we continue to innovate and develop new materials and structures, the knowledge of how these materials behave under thermal stress will remain a cornerstone of effective design and safety.

当我们思考材料的物理特性时，一个重要的现象浮现在脑海中：线性膨胀。这个术语指的是材料在加热时沿长度方向膨胀的方式。这是物理学和工程学中的基本概念，因为它影响结构在温度变化下的行为。例如，当金属棒被加热时，它不仅仅是膨胀；它沿着长度均匀地膨胀。这可以用公式 ΔL = αL0ΔT 来数学描述，其中 ΔL 是长度变化，L0 是原始长度，ΔT 是温度变化，而 α 是材料的线性膨胀系数。理解 线性膨胀 对于设计桥梁、铁路和建筑物的工程师至关重要，因为他们必须考虑材料的膨胀和收缩，以防止结构失效。在日常生活中，我们比我们意识到的更频繁地遇到 线性膨胀。例如，你是否注意到金属罐盖在用热水冲洗后变得更容易打开？这发生是因为热量使金属膨胀，使盖子稍微变大，从而更容易从玻璃罐上取下。同样，当你走在热路面上时，路面建设中使用的材料因阳光的热量而膨胀。如果路面没有考虑到 线性膨胀，它可能会因膨胀的压力而翘曲或开裂。线性膨胀 的影响不仅限于物理结构。在热力学领域，理解材料如何膨胀可以导致各种技术的创新。例如，温控器的设计依赖于 线性膨胀 的原理。双金属条由两种不同的金属结合而成，当加热时，由于两种金属的 线性膨胀 速率不同而弯曲。这种弯曲运动可以用于打开或关闭电路，有效地调节加热系统的温度。此外，线性膨胀 在制造过程中也起着重要作用。当制造精密仪器时，制造商必须考虑温度变化将如何影响产品的尺寸。例如，如果某个部件在特定温度下加工，当生产完成后环境温度显著上升时，它可能无法正确配合。因此，理解和考虑 线性膨胀 对于确保部件在不同条件下正确配合至关重要。总之，线性膨胀 是一个关键概念，影响着我们生活的许多方面，从我们依赖的基础设施到我们每天使用的技术。通过掌握 线性膨胀 背后的原理，我们可以更好地欣赏工程和物理学的复杂性。学生和专业人士都必须理解这一现象，因为它为科学和技术的进步奠定了基础。随着我们不断创新和开发新材料和结构，了解这些材料在热应力下的行为将仍然是有效设计和安全的基石。