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教科版科学三上《空气占据空间吗》PPT课件-(1)
乌鸦是石子把水挤出来的，你们能不能利用（空气）把水从瓶子里挤出来呢？实验材料：橡皮泥、吸管、瓶子先讨论一下。想一想：①橡皮泥有什么用？②你怎样让空气进入瓶中？③你又用什么办法利用空气去挤水？帮帮忙
来做一个实验把一团纸放在杯子的底部，然后将杯子倒扣在水中.预测一下，纸团会湿吗？为什么？
活动一1.杯子竖直倒扣入水底，观察杯子里小球和水的位置；2.杯子不动，拔去白色盖子，观察杯子里小球和水的位置；
开动脑筋想一想，比比谁最棒！1.开始彩球为什么在杯子下方呢？2.后来彩球为什么到杯子上部呢？shop.99114.com/50627572shop.99114.com/50674705shop.99114.com/50798018shop.99114.com/50662906shop.99114.com/50499147shop.99114.com/50657920shop.99114.com/50672964shop.99114.com/51126331shop.99114.com/51232986shop.99114.com/51129260shop.99114.com/51233446shop.99114.com/51131343shop.99114.com/51132188shop.99114.com/51126246shop.99114.com/49830982shop.99114.com/50855587shop.99114.com/51132012shop.99114.com/50855990shop.99114.com/50498383shop.99114.com/51233435shop.99114.com/50866272shop.99114.com/51233066shop.99114.com/51004630shop.99114.com/51028921shop.99114.com/50798552shop.99114.com/51233029shop.99114.com/51235754shop.99114.com/50673234shop.99114.com/50673283shop.99114.com/50672593shop.99114.com/50847408shop.99114.com/50674016shop.99114.com/50857820shop.99114.com/50823805shop.99114.com/50802033shop.99114.com/51130583shop.99114.com/49610836shop.99114.com/51131153shop.99114.com/50668455shop.99114.com/50831388shop.99114.com/51239193shop.99114.com/50673281shop.99114.com/50673437shop.99114.com/50673209shop.99114.com/50669256shop.99114.com/51399270shop.99114.com/51396689shop.99114.com/51398726shop.99114.com/51233072shop.99114.com/51405322shop.99114.com/41244405shop.99114.com/51407253shop.99114.com/51023949shop.99114.com/51408617shop.99114.com/51410378shop.99114.com/51410288shop.99114.com/51238418shop.99114.com/51407265shop.99114.com/48001267shop.99114.com/50637206shop.99114.com/51410820shop.99114.com/51413017shop.99114.com/49312439shop.99114.com/51413260shop.99114.com/51397406shop.99114.com/51410598shop.99114.com/51410528shop.99114.com/48211017shop.99114.com/49826699shop.99114.com/48795003shop.99114.com/51413553shop.99114.com/51399142shop.99114.com/51414416shop.99114.com/50673484shop.99114.com/50673486shop.99114.com/50673407shop.99114.com/51413290shop.99114.com/51413954shop.99114.com/47915143shop.99114.com/50673278shop.99114.com/51413940shop.99114.com/51413944shop.99114.com/51416024shop.99114.com/51415580shop.99114.com/51416036shop.99114.com/50658016shop.99114.com/50648437shop.99114.com/51417568shop.99114.com/50659687shop.99114.com/51418705shop.99114.com/50659865shop.99114.com/51413948shop.99114.com/51417271shop.99114.com/50607661shop.99114.com/51431432shop.99114.com/51424540shop.99114.com/50641325shop.99114.com/48470998shop.99114.com/48215366shop.99114.com/51429024
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结论：空气占据空间。
我们知道水和空气都可以占据空间,可空气和水比较,又有什么不同吗?
活塞针筒刻度注射器
压拉用同样大的力观察活塞位置变化比较空气和水占据空间的不同
注射器推拉实验实验要求：1、用手指轻轻推拉活塞，仔细观察实验现象。2、比较：两者有什么不同？
推动活塞拉动活塞想象一下，空气宝宝在注射器里的变化。把它画下来
发现：空气占据空间的大小可以变化。
空气和水的比较水空气占据空间不能变化占据空间可以变化（易压缩或扩散）能占据空间
作业：１）生活中还有很多空气占据空间的例子，请同学们搜集并记录下来。下节课来汇报。２）生活中还有哪些地方运用了空气可被压缩的性质？请记下来，下节课与同学一起分享。
此课件下载可自行编辑修改，仅供参考！ 感谢您的支持，我们努力做得更好！谢谢
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