무색, 무취이며 인화성이 매우 높은 기체 화학 원소. 원자 번호 1이며 기호는 H이다. 우주에서 가장 가볍고 풍부한 원소이다.
A colorless, odorless, highly flammable gaseous chemical element with atomic number 1, symbolized by H. It is the lightest and most abundant element in the universe.
예문:
"Scientists are researching ways to utilize hydrogen as a sustainable, clean energy source."
"Water molecules are formed when two hydrogen atoms bond with one oxygen atom."
"Because hydrogen gas is so light, it was historically used to fill airships and balloons."