molecular diffusion

简明释义

分子扩散

英英释义

例句

1.In the atmosphere, molecular diffusion helps distribute pollutants evenly over large distances.

在大气中，分子扩散有助于将污染物均匀分布在较大距离上。

2.The process of molecular diffusion is crucial in understanding how substances move within a cell.

在理解物质如何在细胞内移动时，分子扩散过程至关重要。

3.Scientists study molecular diffusion to improve drug delivery systems.

科学家研究分子扩散以改善药物传递系统。

4.Understanding molecular diffusion is essential for designing effective filters.

理解分子扩散对设计有效的过滤器至关重要。

5.The rate of molecular diffusion can be affected by temperature and pressure.

温度和压力会影响分子扩散的速率。

作文

Molecular diffusion is a fundamental process that occurs in various fields of science, particularly in chemistry and biology. It refers to the movement of molecules from an area of higher concentration to an area of lower concentration, driven by the random thermal motion of particles. This process is essential for many natural phenomena, including the way substances mix, how gases exchange in our lungs, and even how nutrients are absorbed in our cells.In the context of biology, molecular diffusion (分子扩散) plays a crucial role in cellular functions. For instance, when oxygen is inhaled, it diffuses through the alveolar membranes in the lungs into the bloodstream. The concentration of oxygen in the alveoli is higher than in the blood, which allows for this efficient transfer. Similarly, carbon dioxide moves in the opposite direction, from the blood into the alveoli, where its concentration is lower. This exchange is vital for respiration and maintaining the body’s overall homeostasis.Moreover, molecular diffusion (分子扩散) is not limited to gases; it also occurs in liquids. When a drop of food coloring is added to water, the color gradually spreads throughout the liquid. This happens because the dye molecules move from an area of high concentration (the drop) to areas of lower concentration (the surrounding water). This simple yet fascinating demonstration illustrates the principles of diffusion and how it facilitates mixing at the molecular level.In industrial applications, molecular diffusion (分子扩散) is critical in processes such as chemical manufacturing and environmental engineering. For example, in the production of pharmaceuticals, understanding how different molecules diffuse can help optimize reactions and improve yields. Additionally, in wastewater treatment, the diffusion of pollutants can be monitored to assess the effectiveness of treatment methods.The rate of molecular diffusion (分子扩散) can be influenced by several factors, including temperature, molecular size, and the medium through which the molecules are diffusing. Generally, higher temperatures increase the kinetic energy of molecules, leading to faster diffusion rates. Conversely, larger molecules tend to diffuse more slowly than smaller ones due to their mass. Furthermore, the viscosity of the medium can also affect how quickly molecules can move; for instance, diffusion occurs more rapidly in gases than in liquids due to the closer packing of molecules in liquids.In summary, molecular diffusion (分子扩散) is a key process that underlies many biological and chemical phenomena. Its implications extend from basic biological functions to complex industrial processes. Understanding the principles of diffusion not only enhances our knowledge of natural systems but also aids in the development of technologies that harness these processes for practical applications. As research continues to advance in this field, the potential for innovative solutions based on molecular diffusion (分子扩散) remains vast and promising.

分子扩散是一个基本过程，发生在科学的各个领域，特别是在化学和生物学中。它指的是分子从高浓度区域向低浓度区域的运动，这一过程是由粒子的随机热运动驱动的。这一过程对于许多自然现象至关重要，包括物质混合的方式、气体在我们肺部的交换，甚至营养物质在细胞中的吸收。在生物学的背景下，molecular diffusion（分子扩散）在细胞功能中发挥着关键作用。例如，当氧气被吸入时，它通过肺泡膜扩散到血液中。肺泡中的氧气浓度高于血液中的浓度，这使得这种有效的转移成为可能。类似地，二氧化碳则从血液中移动到肺泡中，那里浓度较低。这种交换对呼吸和维持身体的整体稳态至关重要。此外，molecular diffusion（分子扩散）不仅限于气体；它也发生在液体中。当一滴食用色素被加入水中时，颜色会逐渐扩散到整个液体中。这是因为染料分子从高浓度区域（滴入的地方）移动到低浓度区域（周围的水）。这个简单而迷人的演示展示了扩散的原理，以及它如何在分子层面上促进混合。在工业应用中，molecular diffusion（分子扩散）在化学制造和环境工程等过程中至关重要。例如，在制药生产中，理解不同分子如何扩散可以帮助优化反应并提高产量。此外，在废水处理过程中，可以监测污染物的扩散，以评估处理方法的有效性。molecular diffusion（分子扩散）的速率可以受到多个因素的影响，包括温度、分子大小以及分子扩散的介质。通常，较高的温度会增加分子的动能，从而导致更快的扩散速率。相反，较大的分子由于其质量而扩散速度往往较慢。此外，介质的粘度也会影响分子的移动速度；例如，气体中的扩散速度通常比液体中要快，因为液体中的分子更紧密地排列在一起。总之，molecular diffusion（分子扩散）是许多生物和化学现象的关键过程。它的意义从基本的生物功能延伸到复杂的工业过程。理解扩散的原理不仅增强了我们对自然系统的认识，还帮助开发利用这些过程的技术，以实现实际应用。随着这一领域研究的持续进展，基于molecular diffusion（分子扩散）的创新解决方案的潜力仍然广阔而充满希望。