A. Because it can use air buoyancy.
因为它可以利用空气的浮力。
Two of the positions are normally used to determine air density based on the measured difference in mass between two air buoyancy artefacts.
二位置通常使用确定空气密度根据在大量上的被测量的区别在二空气浮力人工制品之间。
In the experiment of measuring gravity acceleration with a pendulum, a few error factors are existed, such as complex pendulum, air buoyancy, air resistance and initial displacement.
在利用单摆测重力加速度实验中，有复摆、空气浮力、空气阻力、摆角等多种误差因素。
Air can be pumped into the diving suit to increase buoyancy.
可以往潜水衣中打气增加浮力。
On land, the supportive buoyancy of water is missing, the plant is no longer bathed in a nutrient solution, and air tends to dry things out.
在陆地上，水的浮力支持消失了，植物不再浸泡在营养液中，空气会使植物变干。
Atmospheric gravity waves form when buoyancy pushes air up, and gravity pulls it back down.
当浮力把空气向上推，而重力又把它向下拉的时候，就会形成大气的重力波。
An aircraft, especially a balloon or dirigible, deriving its lift from the buoyancy of surrounding air rather than from aerodynamic motion.
浮空器从周围空气的浮力而不是从空气动力获得提升力的航空器，特指气球或飞船。
And since ethane has roughly the same density as air, the fuel in effect weighs nothing, further reducing the amount of helium needed to create buoyancy.
这里的因果好像有点问题。由于乙烷没影响，燃料的重量又可以忽略不计，所以用来产生浮力的氦气的需求量减少了。
Objective To observe effects of great depth air breathing fast buoyancy ascent on the life signs.
目的观察大深度快速上浮脱险对潜艇艇员生命指征的影响。
In aquatic plants, the palisade cells are absent so that there is more intercellular Spaces (air Spaces) for buoyancy.
在水生植物中，是没有栅状叶肉细胞的，所以有很多胞间隙(气室)以增加浮力。
Hence when they are respectively weighed in air, the buoyancy of the air will render the former heavier.
因此，当他们各自在空气中称重量的时候，空气浮力将使前者更重。
Objective to investigate the effects of great depth air breathing fast buoyancy ascent on the human body, to develop and verify the submarine escape profile and medical support measures.
目的研究大深度快速上浮脱险时对机体的影响，制订、验证脱险方案和保障措施。
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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