氦 (hài) - Helium — a chemical element (He), atomic number & a colorless, odorless, inert monatomic gas, the first

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Helium — a chemical element (He), atomic number 2;

a colorless, odorless, inert monatomic gas, the first in the noble gas group in the periodic table.

Helium — a chemical element (He), atomic numbera colorless, odorless, inert monatomic gas, the first

Usage highlights

Helium balloonLiquid heliumHelium atomHelium nucleusHelium gasHelium
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Usage & contexts

Examples

  • Helium is used to fill balloons (氦气球).
  • Liquid helium is used for cooling (液氦).
  • Helium is the second lightest element (氦元素).
  • The sun contains helium (太阳中的氦).

Collocations

  • Helium balloon(氦气球)
  • Liquid helium(液氦)
  • Helium atom(氦原子)
  • Helium nucleus(氦核)
  • Helium gas(氦气)
  • Helium-neon laser(氦氖激光器)

Cultural background

FAQ
  • Helium was first detected in the sun's spectrum in 1868, hence its name from Helios, the Greek sun god.
  • As a noble gas, helium is chemically inert and non-flammable, making it safe for various applications.
  • Helium is crucial in scientific research, particularly in cryogenics and as a protective gas in welding.

FAQ