helium

简明释义

英[ˈhiːliəm]美[ˈhiːliəm]

n. [化学]氦（符号为 He, 2号元素）

英英释义

单词用法

同义词

反义词

例句

1.A regulatory agency should ensure that helium is used carefully.

应该有一个监管机构确保氦的使用是谨慎的。

2.It contained very little hydrogen and helium.

它含有非常少的氢和氦。

3.Firstly, all existing supplies of helium ought to be conserved and released only by permit, with medical uses receiving precedence over other commercial or recreational demands.

首先，所有现有的氦供应应该被保存下来，并且只有在获得许可的情况下才能释放，医疗用途应优先于其他商业或娱乐需求。

4.The balloon may be filled with helium or hydrogen.

气球中可能会充满氦气或者氢气。

5.However, the amount of helium in the universe, as measured by spectroscopy, suggests that there are far more baryons in the universe than estimates based on galactic luminosity indicate.

然而，通过光谱学测量，宇宙中氦的数量表明，宇宙中重子的数量要比基于星系光度所估计的要多得多。

6.The Jovian planets have very thick atmospheres consisting of varying amounts of hydrogen, helium, methane, and ammonia.

木星的行星有非常厚的大气层，且由不同数量的氢、氦、甲烷和氨等元素组成。

7.Helium is the by product of millennia of radioactive decay from the elements thorium and uranium.

氦是钍和铀元素数千年放射性衰变的副产品。

8.Helium is a very light gas.

氦是一种很轻的气体。

9.Hydrogen turns into Helium, which releases energy.

氢变成氦的时候会释放能量。

10.The party balloons were filled with helium 氦气 so they would float.

派对的气球充满了氦气 氦气，所以它们会漂浮。

11.The helium 氦气 balloon floated away into the sky.

那个氦气 氦气气球飘向了天空。

12.When inhaled, helium 氦气 can make your voice sound high-pitched.

当吸入氦气 氦气时，可以使你的声音听起来尖细。

13.Scientists use helium 氦气 in cryogenics to cool superconducting magnets.

科学家在低温技术中使用氦气 氦气来冷却超导磁体。

14.Astronomers study helium 氦气 in stars to understand their composition.

天文学家研究恒星中的氦气 氦气以了解它们的成分。

作文

Helium is one of the most abundant elements in the universe, second only to hydrogen. It is a colorless, odorless, and tasteless gas that is lighter than air. The unique properties of helium (氦) make it an essential element in various scientific and industrial applications. For instance, helium (氦) is widely used in cryogenics, particularly in the cooling of superconducting magnets, which are crucial for MRI machines and particle accelerators. Additionally, helium (氦) is utilized in the aerospace industry for inflating balloons and airships, as it provides lift without the risk of combustion associated with hydrogen.One of the most fascinating aspects of helium (氦) is its role in the universe's lifecycle. Stars, including our sun, produce helium (氦) through the process of nuclear fusion. In this process, hydrogen nuclei combine under extreme pressure and temperature to form helium (氦) nuclei, releasing vast amounts of energy in the form of light and heat. This energy is what powers stars and allows them to shine for billions of years.The discovery of helium (氦) dates back to 1868 when it was first identified in the solar spectrum by French astronomer Pierre Janssen during a solar eclipse. He observed a bright yellow line in the spectrum, which was later confirmed to be due to helium (氦). It wasn’t until 1895 that helium (氦) was isolated on Earth by Scottish chemist Sir William Ramsay. This marked a significant milestone in the field of chemistry, as helium (氦) became the first noble gas to be discovered.In addition to its scientific significance, helium (氦) has also found its way into popular culture. Many people associate helium (氦) with party balloons that float gracefully in the air. When inhaled, helium (氦) alters the sound of a person's voice, making it higher-pitched and squeaky, which adds an element of fun to gatherings. However, despite its playful reputation, it is essential to handle helium (氦) safely. Inhaling large amounts can displace oxygen in the lungs, leading to suffocation.The extraction of helium (氦) is primarily done from natural gas reserves, where it is found in concentrations ranging from 0.1% to 7%. Due to its non-renewable nature and the increasing demand for helium (氦) in various industries, there is growing concern about its depletion. Scientists and researchers are actively exploring alternative sources and methods to produce helium (氦), including potential extraction from the moon’s regolith, which may contain significant amounts of this precious gas.In conclusion, helium (氦) is not just a simple gas used for filling balloons but a vital element that plays a crucial role in both our everyday lives and the cosmos. Its unique properties and applications in science and industry highlight the importance of understanding and preserving this resource. As we continue to explore the universe and push the boundaries of technology, helium (氦) will undoubtedly remain a key player in our quest for knowledge and innovation.

氦是宇宙中最丰富的元素之一，仅次于氢。它是一种无色、无味且无臭的气体，密度比空气小。氦（氦）的独特性质使其在各种科学和工业应用中至关重要。例如，氦（氦）广泛用于低温技术，特别是在超导磁体的冷却中，这对于MRI机器和粒子加速器至关重要。此外，氦（氦）还被用于航空航天工业，用于充气气球和飞艇，因为它提供升力而不涉及氢的燃烧风险。氦（氦）最迷人之处在于它在宇宙生命周期中的作用。包括我们的太阳在内的恒星通过核聚变过程产生氦（氦）。在这一过程中，氢核在极高的压力和温度下结合形成氦（氦）核，释放出大量以光和热的形式存在的能量。这种能量是恒星的动力，使其能够发光数十亿年。氦（氦）的发现可以追溯到1868年，当时法国天文学家皮埃尔·让森在日食期间首次在太阳光谱中识别出它。他观察到光谱中出现了一条明亮的黄色线，后来证实是由于氦（氦）造成的。直到1895年，苏格兰化学家威廉·拉姆齐才在地球上分离出氦（氦）。这标志着化学领域的重要里程碑，因为氦（氦）成为第一个被发现的惰性气体。除了科学意义外，氦（氦）也进入了流行文化。许多人将氦（氦）与漂浮在空中的派对气球联系在一起。当吸入时，氦（氦）会改变一个人的声音，使其音调更高且尖细，为聚会增添了乐趣。然而，尽管它有着玩乐的声誉，但安全处理氦（氦）至关重要。吸入大量氦（氦）可能会取代肺部的氧气，导致窒息。氦（氦）的提取主要来自天然气储备，其中含量从0.1%到7%不等。由于其不可再生特性以及各行业对氦（氦）的需求不断增加，人们越来越担心其枯竭。科学家和研究人员正在积极探索替代来源和生产氦（氦）的方法，包括从月球表层土壤中提取，这可能包含大量这种珍贵气体。总之，氦（氦）不仅仅是一种用于充气球的简单气体，而是一个至关重要的元素，在我们的日常生活和宇宙中发挥着重要作用。它的独特性质和在科学和工业中的应用突显了理解和保护这一资源的重要性。随着我们继续探索宇宙并推动技术的边界，氦（氦）无疑将继续在我们追求知识和创新的过程中扮演关键角色。