c bottles, the bottle thermal expansion of the air, went to the glass, which increases stress, put a cup of water pressure to get out bubbles on a straw; and when the ice water outside the wall of water into the bottle, the bottle the air was cooling, the pressure inside the small, water will run into the bottle.

　　i also know a lot about life热胀冷缩the situation, really funny, love the students use their brains, let us explore together!
 

上一页  [1] [2] [3]