这种酸使金属起反应，并放出气体。
这种金属氢化物的粉末，在受热后会分解，释放出气体来。
When heated, these metal hydride powders decompose, liberating the gas.
我放手的话,气会从这个方向走掉,这气球往此方向,放出气体。
So, if I do it like this, and I let it go the air will come out in this direction and so then it means the balloon is pushing on the air in this direction.
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