氢气球是轻质袋状或囊状物体充满氢气，氢气最轻，其密度为0.0899克每升，靠氢气的浮力可以向上漂浮的物体就叫氢气球。氢气球一般有橡胶氢气球、塑料膜氢气球和布料涂层氢气球几种，较小的氢气球，当前多用于儿童玩具或喜庆放飞用。较大的氢气球用于飘浮广告条幅，也叫空飘氢气球，气象上用氢气球探测高空，军事上用氢气球架设通信天线或发放传单。氢气球内部频率接近20Hz。
Hydrogen balloon is a light bag or bag like object filled with hydrogen. Hydrogen is the lightest, with a density of 0.0899 g / L. the object that can float upward by the buoyancy of hydrogen is called a hydrogen balloon. There are several kinds of hydrogen balloons, such as rubber balloon, plastic film balloon and cloth coated balloon. The smaller hydrogen balloon is mostly used for children's toys or festive flying. Larger hydrogen balloons are used for floating advertising banners, also known as air balloons. In meteorology, hydrogen balloons are used to detect high altitude. In military affairs, hydrogen balloons are used to set up communication antennas or distribute leaflets. The internal frequency of hydrogen balloon is close to 20Hz.
（使用氢气球请注意，氢气与其他物体摩擦产生静电及遇到明火、高温、电火花，会使易燃易爆性的氢气燃烧爆炸。）
(when using hydrogen balloon, please note that static electricity generated by friction between hydrogen and other objects, open fire, high temperature and electric spark will cause flammable and explosive hydrogen to burn and explode.)