At present, there are two kinds of weather balloons hydrogen charging instruments-one is buoyancybalance, 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。
2
According to the principle of the interference of two beams and the buoyancy law, the principle and design of one buoyancybalance for measuring little mass change of a body is discussed.
利用双光束干涉原理与浮力定律，对一台能测定物体微小质量变化的浮力天平原理与设计进行了讨论。
3
Finally, the values of roll stability, in accordance with the condition of the balance between gravity and buoyancy of ship in waves and also with that the sum of trim moments is zero are obtained.