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Why is it that you can't put down hydrogen gas? If you had a big balloon full of hydrogen gas, like the first gondola balloons pioneered in 18th-century France, you'd find that it rises in the air quite dramatically.
為什么氫氣總是會飄起來？如果你有一個充滿氫氣的大氣球，就像18世紀法國飛行先去發明的吊籃熱氣球，你會發現熱氣球在空中飄得很高。
You know that a piece of wood will float in water, right?
你知道一塊木頭能浮于水上，是吧？
Sure.
當然。
That's because the wood is less dense than the water. When you're in a buoyant medium, having a lesser density than your surroundings means you'll float. Something with greater density than water, like a stone, will sink.
因為木頭密度比水的密度小。當你所在的浮力介質密度小于周圍，你就會飄起來。石頭一類密度大于水的密度的就會下沉。
Air also has the quality of buoyancy. Anything less dense than the air will rise, just like a piece of wood held underwater and then let go. Hydrogen gas is only about one fourteenth as dense as air. So up it goes!
空氣也有漂浮的特質。密度小于空氣的就會漂浮，就像放在水下的木頭會浮起來一樣。氫氣的密度僅僅是空氣密度的1/14，所以氫氣能漂浮。
In fact, it rises with such force that it can even haul up a huge balloon, with a gondola and riders!
事實上，氫氣上升的力量足以托起載客的吊籃熱氣球。
