hydrogen

hydrogen — noun

1. the simplest known element, which exists as a colourless gas and weighs less tha

1.名詞B1
釋義

the simplest known element, which exists as a colourless gas and weighs less than any other substance; when you burn it together with oxygen, water is created.

例句

The bus company is testing hydrogen fuel cells as a cleaner alternative to diesel engines.

collocation: hydrogen fuel cells

Adisa watched the hydrogen-filled balloon drift up toward the ceiling of the laboratory.

hydrogen-filled [noun] as a compound adjective

文法句型

hydrogen + noun (hydrogen fuel, hydrogen atom, hydrogen bond)

用法筆記

In everyday conversation, hydrogen often appears in compound nouns such as hydrogen fuel, hydrogen power, and hydrogen bomb. In scientific writing, it is commonly treated as an uncountable noun, though the plural hydrogens may be used informally to mean 'hydrogen atoms.'

常見錯誤

❌Water is two hydrogen and one oxygen.
✅Water is made of two hydrogen atoms and one oxygen atom.
💡You need to add 'atom(s)' when describing the molecular composition of a compound.
❌Helium is very flammable, like hydrogen.
✅Unlike hydrogen, helium does not burn.
💡Hydrogen is highly flammable; helium is a non-flammable noble gas. Learners often confuse the two because both are used in balloons.