Definition of helium in English:

helium

noun ˈhiːlɪəmˈhiliəm

mass noun

The chemical element of atomic number 2, an inert gas which is the lightest member of the noble gas series.
Helium occurs in traces in air, and more abundantly in natural gas deposits. It is used as a lifting gas for balloons and airships, and liquid helium (boiling point: 4.2 kelvins, −268.9°C) is used as a coolant. Helium is produced in stars as the main product of the thermonuclear fusion of hydrogen, and is the second most abundant element in the universe after hydrogen
Example sentencesExamples
- Does it contain yet more unknown chemical elements, like helium?
- The atomic elements heavier than hydrogen and helium could not have been produced during the inferno of the Big Bang.
- Even though helium is twice as dense as hydrogen, this is less than one metric ton of gas.
- Because it is chemically inert, helium was not identified on Earth until some time later, in 1895.
- Argon is denser than air, and certainly helium, which means that it has more molecules to retain heat.
- They were the ones who were always crying and throwing fits when they lost their helium balloons.
- During the history of our universe, more helium was made because the process that drives the stars turns hydrogen into helium.
- Other light elements that are commonly proposed for the outer core are silicon, carbon, helium, and nitrogen.
- In composition it resembles a small star, with helium and hydrogen as the main gases.
- Ramsay realized that argon and helium might be members of a hitherto unsuspected new group in the Periodic Table.
- Over the next few years many types of laser were built, some using a mixture of helium and neon, others carbon dioxide or organic dyes.
- In practice air is nowadays never used in deep diving, the nitrogen being replaced by helium, which is far less soluble in fat.
- Today, balloons in Japan are lifted by hot air rather than the more expensive helium or hydrogen.
- Cool the detectors with liquid nitrogen instead of solid hydrogen or liquid helium.
- There he worked with Born on atomic theory, writing a joint paper with him on helium.
- During the last years of his life he worked steadily on the wave mechanics of the hydrogen and helium atom.
- When most of the hydrogen is fused into helium, fusion stops and and gravity again takes over.
- At launch, the balloon is partially inflated with helium and expands as it rises.
- Eventually, there will not be any hydrogen left in the center of the Sun to make helium.
- However, if a proton is added to the hydrogen atom, a new element, helium is created.

Origin

Late 19th century: modern Latin, from Greek hēlios 'sun', because its existence was inferred from an emission line in the sun's spectrum.

Rhymes

berkelium, epithelium, nobelium, Sealyham

Definition of helium in US English:

helium

nounˈhēlēəmˈhiliəm

The chemical element of atomic number 2, an inert gas which is the lightest member of the noble gas series.
Helium occurs in traces in air, and more abundantly in natural gas deposits. It is used as a lifting gas for balloons and airships, and liquid helium (boiling point: 4.2 kelvins, −268.9°C) is used as a coolant. Helium is produced in stars as the main product of the thermonuclear fusion of hydrogen, and is the second most abundant element in the universe after hydrogen
Example sentencesExamples
- There he worked with Born on atomic theory, writing a joint paper with him on helium.
- At launch, the balloon is partially inflated with helium and expands as it rises.
- During the last years of his life he worked steadily on the wave mechanics of the hydrogen and helium atom.
- When most of the hydrogen is fused into helium, fusion stops and and gravity again takes over.
- In practice air is nowadays never used in deep diving, the nitrogen being replaced by helium, which is far less soluble in fat.
- Eventually, there will not be any hydrogen left in the center of the Sun to make helium.
- Other light elements that are commonly proposed for the outer core are silicon, carbon, helium, and nitrogen.
- Because it is chemically inert, helium was not identified on Earth until some time later, in 1895.
- In composition it resembles a small star, with helium and hydrogen as the main gases.
- Argon is denser than air, and certainly helium, which means that it has more molecules to retain heat.
- Today, balloons in Japan are lifted by hot air rather than the more expensive helium or hydrogen.
- The atomic elements heavier than hydrogen and helium could not have been produced during the inferno of the Big Bang.
- They were the ones who were always crying and throwing fits when they lost their helium balloons.
- Over the next few years many types of laser were built, some using a mixture of helium and neon, others carbon dioxide or organic dyes.
- During the history of our universe, more helium was made because the process that drives the stars turns hydrogen into helium.
- Even though helium is twice as dense as hydrogen, this is less than one metric ton of gas.
- Cool the detectors with liquid nitrogen instead of solid hydrogen or liquid helium.
- Does it contain yet more unknown chemical elements, like helium?
- However, if a proton is added to the hydrogen atom, a new element, helium is created.
- Ramsay realized that argon and helium might be members of a hitherto unsuspected new group in the Periodic Table.

Origin

Late 19th century: modern Latin, from Greek hēlios ‘sun’, because its existence was inferred from an emission line in the sun's spectrum.

单词	helium
释义	Definition of helium in English: helium noun ˈhiːlɪəmˈhiliəm mass noun The chemical element of atomic number 2, an inert gas which is the lightest member of the noble gas series. Helium occurs in traces in air, and more abundantly in natural gas deposits. It is used as a lifting gas for balloons and airships, and liquid helium (boiling point: 4.2 kelvins, −268.9°C) is used as a coolant. Helium is produced in stars as the main product of the thermonuclear fusion of hydrogen, and is the second most abundant element in the universe after hydrogen Example sentencesExamples Does it contain yet more unknown chemical elements, like helium? The atomic elements heavier than hydrogen and helium could not have been produced during the inferno of the Big Bang. Even though helium is twice as dense as hydrogen, this is less than one metric ton of gas. Because it is chemically inert, helium was not identified on Earth until some time later, in 1895. Argon is denser than air, and certainly helium, which means that it has more molecules to retain heat. They were the ones who were always crying and throwing fits when they lost their helium balloons. During the history of our universe, more helium was made because the process that drives the stars turns hydrogen into helium. Other light elements that are commonly proposed for the outer core are silicon, carbon, helium, and nitrogen. In composition it resembles a small star, with helium and hydrogen as the main gases. Ramsay realized that argon and helium might be members of a hitherto unsuspected new group in the Periodic Table. Over the next few years many types of laser were built, some using a mixture of helium and neon, others carbon dioxide or organic dyes. In practice air is nowadays never used in deep diving, the nitrogen being replaced by helium, which is far less soluble in fat. Today, balloons in Japan are lifted by hot air rather than the more expensive helium or hydrogen. Cool the detectors with liquid nitrogen instead of solid hydrogen or liquid helium. There he worked with Born on atomic theory, writing a joint paper with him on helium. During the last years of his life he worked steadily on the wave mechanics of the hydrogen and helium atom. When most of the hydrogen is fused into helium, fusion stops and and gravity again takes over. At launch, the balloon is partially inflated with helium and expands as it rises. Eventually, there will not be any hydrogen left in the center of the Sun to make helium. However, if a proton is added to the hydrogen atom, a new element, helium is created. Origin Late 19th century: modern Latin, from Greek hēlios 'sun', because its existence was inferred from an emission line in the sun's spectrum. Rhymes berkelium, epithelium, nobelium, Sealyham Definition of helium in US English: helium nounˈhēlēəmˈhiliəm The chemical element of atomic number 2, an inert gas which is the lightest member of the noble gas series. Helium occurs in traces in air, and more abundantly in natural gas deposits. It is used as a lifting gas for balloons and airships, and liquid helium (boiling point: 4.2 kelvins, −268.9°C) is used as a coolant. Helium is produced in stars as the main product of the thermonuclear fusion of hydrogen, and is the second most abundant element in the universe after hydrogen Example sentencesExamples There he worked with Born on atomic theory, writing a joint paper with him on helium. At launch, the balloon is partially inflated with helium and expands as it rises. During the last years of his life he worked steadily on the wave mechanics of the hydrogen and helium atom. When most of the hydrogen is fused into helium, fusion stops and and gravity again takes over. In practice air is nowadays never used in deep diving, the nitrogen being replaced by helium, which is far less soluble in fat. Eventually, there will not be any hydrogen left in the center of the Sun to make helium. Other light elements that are commonly proposed for the outer core are silicon, carbon, helium, and nitrogen. Because it is chemically inert, helium was not identified on Earth until some time later, in 1895. In composition it resembles a small star, with helium and hydrogen as the main gases. Argon is denser than air, and certainly helium, which means that it has more molecules to retain heat. Today, balloons in Japan are lifted by hot air rather than the more expensive helium or hydrogen. The atomic elements heavier than hydrogen and helium could not have been produced during the inferno of the Big Bang. They were the ones who were always crying and throwing fits when they lost their helium balloons. Over the next few years many types of laser were built, some using a mixture of helium and neon, others carbon dioxide or organic dyes. During the history of our universe, more helium was made because the process that drives the stars turns hydrogen into helium. Even though helium is twice as dense as hydrogen, this is less than one metric ton of gas. Cool the detectors with liquid nitrogen instead of solid hydrogen or liquid helium. Does it contain yet more unknown chemical elements, like helium? However, if a proton is added to the hydrogen atom, a new element, helium is created. Ramsay realized that argon and helium might be members of a hitherto unsuspected new group in the Periodic Table. Origin Late 19th century: modern Latin, from Greek hēlios ‘sun’, because its existence was inferred from an emission line in the sun's spectrum.
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