dewar flask

简明释义

杜瓦真空瓶

英英释义

例句

1.A dewar flask can keep gases in a liquid state for extended periods.

德瓦瓶可以将气体保持在液态状态很长时间。

2.The scientist used a dewar flask to store the liquid nitrogen safely.

科学家使用德瓦瓶安全地存储液氮。

3.During the lab demonstration, the teacher showed how to handle a dewar flask correctly.

在实验室演示中，老师展示了如何正确处理德瓦瓶。

4.In cryogenics, a dewar flask is essential for maintaining low temperatures.

在低温技术中，德瓦瓶对于维持低温至关重要。

5.We filled the dewar flask with helium for our experiments.

我们为实验填充了德瓦瓶中的氦气。

作文

The world of science is filled with fascinating tools and equipment that help researchers and scientists conduct their experiments effectively. One such essential tool is the dewar flask, which plays a crucial role in the storage and transportation of cryogenic liquids. A dewar flask is essentially an insulated container designed to keep substances at extremely low temperatures, and it is named after the Scottish scientist James Dewar, who invented it in the late 19th century.The primary function of a dewar flask is to minimize heat transfer between the contents inside the flask and the external environment. This is achieved through its unique design, which typically consists of two walls with a vacuum in between them. The vacuum acts as an insulator, preventing heat from entering or escaping the flask. As a result, a dewar flask can maintain the low temperatures necessary for storing liquid nitrogen, liquid helium, and other cryogenic materials for extended periods.In laboratories, the use of a dewar flask is indispensable. Researchers rely on it to preserve biological samples, conduct experiments that require low temperatures, and even transport sensitive materials without risking their integrity. For example, in the field of biology, a dewar flask is often used to store sperm, eggs, and embryos for assisted reproductive technologies. The ability to maintain these samples at very low temperatures ensures that they remain viable for future use.Moreover, the dewar flask is not limited to scientific research; it also finds applications in various industries. In the medical field, for instance, hospitals and clinics use dewar flasks to store vaccines and other temperature-sensitive medications. The stability provided by the flask ensures that these vital substances do not lose their effectiveness due to temperature fluctuations.Another interesting aspect of the dewar flask is its role in educational settings. Many schools and universities incorporate demonstrations using dewar flasks during chemistry and physics classes. Students can observe the effects of extreme cold on different materials, providing a hands-on learning experience that enhances their understanding of scientific principles. These demonstrations often include dramatic visual effects, such as the shattering of rubber balls or the rapid condensation of water vapor, captivating students' attention and sparking their interest in science.In conclusion, the dewar flask is a remarkable invention that has significantly impacted the fields of science, medicine, and education. Its ability to maintain low temperatures while minimizing heat transfer makes it an invaluable tool for researchers and professionals alike. Understanding the importance of the dewar flask allows us to appreciate the intricate processes involved in scientific experimentation and the preservation of life-saving materials. As technology continues to advance, the dewar flask will undoubtedly remain a critical component in the ongoing quest for knowledge and innovation in various disciplines.

科学的世界充满了迷人的工具和设备，帮助研究人员和科学家有效地进行实验。其中一个重要的工具就是德瓦瓶，它在低温液体的储存和运输中发挥着至关重要的作用。德瓦瓶本质上是一个绝缘容器，旨在保持物质在极低温度下，它以苏格兰科学家詹姆斯·德瓦的名字命名，他在19世纪末发明了它。德瓦瓶的主要功能是最小化瓶内内容物与外部环境之间的热量传递。这是通过其独特的设计实现的，通常由两层壁构成，中间有真空。真空作为绝缘体，防止热量进入或逃逸。因此，德瓦瓶可以在较长时间内维持储存液氮、液氦和其他低温材料所需的低温。在实验室中，德瓦瓶的使用是不可或缺的。研究人员依赖它来保存生物样本，进行需要低温的实验，甚至在不危及材料完整性的情况下运输敏感材料。例如，在生物学领域，德瓦瓶通常用于存储精子、卵子和胚胎，以便进行辅助生殖技术。将这些样本保持在非常低的温度下的能力确保它们在未来使用时仍然具有活性。此外，德瓦瓶不仅限于科学研究；它在各个行业中也找到了应用。在医疗领域，例如，医院和诊所使用德瓦瓶来存储疫苗和其他对温度敏感的药物。瓶子提供的稳定性确保这些重要物质不会因温度波动而失去效果。德瓦瓶的另一个有趣方面是它在教育环境中的作用。许多学校和大学在化学和物理课程中使用德瓦瓶进行演示。学生可以观察极冷对不同材料的影响，提供一种动手学习的体验，增强他们对科学原理的理解。这些演示通常包括戏剧性的视觉效果，例如橡胶球的破裂或水蒸气的快速凝结，吸引学生的注意力并激发他们对科学的兴趣。总之，德瓦瓶是一项了不起的发明，对科学、医学和教育领域产生了重大影响。它在保持低温的同时最小化热量传递的能力，使其成为研究人员和专业人士的宝贵工具。理解德瓦瓶的重要性使我们能够欣赏科学实验和生命拯救材料保存过程中涉及的复杂过程。随着技术的不断进步，德瓦瓶无疑将继续在各个学科的知识和创新追求中扮演关键角色。