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在节日里,彩色气球迎风飘舞。放开了,它会冉冉腾空,直至云霄。为什么彩球会上升呢?因为球内灌的气体是所有气体中最轻的一种——氢气,人们称这种彩球为“氢气球”。人们早在16世纪就发现了氢。氢在“元素周期表”中坐在第一位。同坐在这个位子上的有氢的“三兄弟”:
In the festival, colorful balloons dance in the wind. Let go, it will vacate until it reaches the sky. Why does the ball rise? Because the gas in the ball is the lightest of all gases—hydrogen. People call it a “hydrogen balloon.” People discovered hydrogen as early as the 16th century. Hydrogen sits first in the “Periodic Table of Elements”. With the “three brothers” who are sitting on this seat: