轻飘飘的科学Floaty science
气球为什么会飞Why Balloons Float
里面装得比外面空气轻，就会往上飘。Fill it lighter than surrounding air and it rises.
第 1 站Stop 1
科学卡片Science Cards
点一下卡片翻过来。Pad 上点按就能翻。Tap a card to flip — tap works on Pad too.
第 2 站Stop 2
容易上飘 / 易下沉Likely rise / sink
哪些更容易飞起来？Which tend to rise?
⬆️ 易上飘Rise
⬇️ 易下沉Sink
第 3 站Stop 3
安全玩气球Safe balloon play
点出安全做法。Tap safe practices.
第 4 站Stop 4
点点小气球Tap little balloons
点出现的气球。Tap appearing balloons.