Aircraft use lift from their wings to stay aloft, while submarines operate like underwater balloons, adjusting their buoyancy to sink or rise.
飞行器利用机翼上下两面的压力差形成提升力以平稳的在空中飞行，而潜艇在原理上形同海下的热气球，通过调节自身浮力或升或降。
Each of the balloons has its own buoyancy.
每一个气球有它自己的浮力。
At present, there are two kinds of weather balloons hydrogen charging instruments-one is buoyancy balance, and the other equalizer.
目前气象气球充氢设备主要有浮力天平和平衡器两种。
Compared with balloons using hot air or gas of which the mass is lower than that of air to produce the buoyancy, the vacuum balloon is convenient to operate.
比较使用热空气或使用低于空气质量的气体产生浮力的气球，操作方便。
Compared with balloons using hot air or gas of which the mass is lower than that of air to produce the buoyancy, the vacuum balloon is convenient to operate.
比较使用热空气或使用低于空气质量的气体产生浮力的气球，操作方便。
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