The atmospheric air pressure is low, a major factor in the air does not flow. As a result of the air does not flow, make the tiny particles in the air is gathered, floating in the air.

英语翻译 1。大气空气气压低，空气不流动时主要因素。由于空气的不流动，使空气中的微小颗粒聚集，漂浮在空气中。

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Explain that the air around them presses against everything and likewise presses down on the water in the jar, forcing the water up the neck of the bottle when atmospheric air pressure rises.

解释说，他们周围空气罐压反对一切，同样按下在水面上，迫使空气压力上升了水的瓶子颈部当大气。

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Every 1000 metres increase in altitude reduces atmospheric pressure - and hence the density of the air - by about 11 per cent (though the precise formula is more complicated than this).

海拔每上升1000米大气压力- - -也就是空气密度- - -会降低大概11%(虽然精确的公式比这要更复杂。)

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Atmospheric pressure is caused by the weight of the air over our heads.

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