sublimation point

简明释义

升华点

英英释义

例句

1.In the context of freeze-drying, knowing the sublimation point helps optimize the drying process.

在冷冻干燥的过程中，了解升华点有助于优化干燥过程。

2.The sublimation point can vary based on atmospheric pressure, making it an important factor in chemistry experiments.

由于大气压力的变化，升华点可能会有所不同，这使其成为化学实验中的一个重要因素。

3.The sublimation point of dry ice is -78.5 degrees Celsius, which is why it turns directly into gas at room temperature.

干冰的升华点是-78.5摄氏度，这就是它在室温下直接变成气体的原因。

4.Understanding the sublimation point of various substances is crucial in the field of material science.

了解各种物质的升华点在材料科学领域至关重要。

5.When studying phase changes, the sublimation point provides insight into a substance's properties.

在研究相变时，升华点提供了对物质特性的深入了解。

作文

The concept of the sublimation point is a fascinating topic in the realm of physical chemistry. To understand it better, we must first define what sublimation is. Sublimation is the process by which a solid transitions directly into a gas without passing through the liquid phase. This phenomenon occurs under specific conditions of temperature and pressure, and the sublimation point refers to the exact temperature at which this transition takes place for a given substance.For example, dry ice, which is solid carbon dioxide, sublimates at -78.5 degrees Celsius at atmospheric pressure. When exposed to room temperature, dry ice does not melt into a liquid but instead transforms directly into carbon dioxide gas. This unique property makes dry ice an excellent choice for refrigeration and creating fog effects in theatrical productions. The sublimation point of a substance is crucial for various applications in both industrial and laboratory settings.Understanding the sublimation point also requires knowledge of phase diagrams. A phase diagram is a graphical representation that shows the phase of a substance (solid, liquid, or gas) at different temperatures and pressures. The line that separates the solid and gas phases on this diagram indicates where sublimation occurs. By studying these diagrams, scientists can predict how a material will behave under varying environmental conditions. This understanding is essential in fields such as materials science, meteorology, and even culinary arts, where chefs use techniques involving sublimation to create unique dishes.In addition to its scientific significance, the sublimation point has intriguing implications in everyday life. For instance, many people may not realize that certain perfumes and fragrances rely on sublimation to release their scents. The solid compounds in these products can sublime, allowing the fragrance molecules to disperse into the air and create the pleasant aromas we enjoy. Similarly, some freeze-dried foods undergo sublimation during their preparation, ensuring that they retain their flavor and nutritional value while being lightweight and easy to store.Moreover, the sublimation point is not just limited to synthetic substances. Natural compounds, such as snow and ice, also exhibit sublimation under the right conditions. In colder climates, one might observe snow disappearing on sunny days even when temperatures remain below freezing. This process is a direct result of sublimation, as the solid water molecules transition into vapor without becoming liquid water first.In conclusion, the sublimation point is a critical concept that bridges the gap between solid and gaseous states of matter. Its applications span across various fields, from science and industry to everyday life. By understanding the sublimation point, we gain insights into the behavior of materials and the underlying principles that govern phase changes. This knowledge not only enhances our appreciation of the natural world but also opens up new possibilities for innovation and creativity in multiple domains.

“升华点”这一概念在物理化学领域是一个引人入胜的话题。要更好地理解它，我们首先必须定义什么是升华。升华是指固体直接转变为气体而不经过液相的过程。这种现象发生在特定的温度和压力条件下，而“升华点”是指某种物质进行这种转变时的确切温度。例如，干冰，即固态二氧化碳，在常压下的升华点为-78.5摄氏度。当暴露在室温下时，干冰不会融化成液体，而是直接转变为二氧化碳气体。这一独特的性质使得干冰成为制冷和在戏剧制作中制造雾效应的绝佳选择。“升华点”对于工业和实验室环境中的各种应用至关重要。理解“升华点”还需要了解相图。相图是一个图形表示，显示了在不同温度和压力下物质的相（固体、液体或气体）。分隔固体和气体相的线表明升华发生的位置。通过研究这些图，科学家可以预测材料在不同环境条件下的行为。这种理解在材料科学、气象学甚至烹饪艺术等领域都是必不可少的，厨师们利用涉及升华的技术来创造独特的菜肴。除了科学意义外，“升华点”在日常生活中也具有有趣的影响。例如，许多人可能没有意识到某些香水和香料依赖于升华来释放其气味。这些产品中的固体化合物可以升华，使香味分子散布到空气中，创造出我们所享受的愉悦芳香。同样，一些冷冻干燥食品在制备过程中也经历升华，确保它们在轻便易储存的同时保持风味和营养价值。此外，“升华点”不仅限于合成物质。自然化合物，如雪和冰，也在适当条件下表现出升华。在寒冷气候中，人们可能会观察到雪在阳光明媚的日子里即使温度保持在冰点以下也会消失。这一过程是升华的直接结果，因为固态水分子在未先变为液态水的情况下转变为水蒸气。总之，“升华点”是一个关键概念，它架起了固态与气态物质之间的桥梁。它的应用跨越多个领域，从科学和工业到日常生活。通过理解“升华点”，我们获得了对材料行为及其相变背后基本原理的深入了解。这一知识不仅增强了我们对自然世界的欣赏，还为多个领域的创新和创造打开了新的可能性。