气球扬声器

摘要

＜正＞我们知道扬声器可以让声音放大,但你知道一个小小的气球也有这个能力吗?Speakers are used to make sure sounds are clear and easy for us to hear.They are used everywhere from music players to phones.Let’s turn a balloon into a simple speaker!A balloon1.Blow up the balloon and tie it off to secure the air inside.2.Hold the balloon up to your ear.3.Lightly tap the other side of the balloon with your finger.4.The sound will be louder than you may expect.