工作就用美篇工作版","guide_search_desc":"海量模板范文,一键做同款 工作就用美篇工作版","img_beautify_switch":0,"ad_free":0,"text_direction":1,"template":{"id":9107,"series_id":18,"theme_id":18},"container":{},"redirect":{"redirect_type":1,"img_url":false,"link_url":"/wap/downloadpage/backpage","button_bg_color":false,"button_desc":false,"redirect_desc":false},"edit_date_str":"发布于 2021-02-26","current_time":1744296284,"font_name":"","rcmd_meipian":0,"hide_article_link":0,"from_wechat":false,"topk_keywords":[{"name":"实验","score":0.331341},{"name":"吸管","score":0.188929},{"name":"果汁","score":0.149437},{"name":"同学","score":0.137259},{"name":"白纸","score":0.132233},{"name":"小花","score":0.113772},{"name":"剪刀","score":0.102895},{"name":"纸张","score":0.083531},{"name":"白醋","score":0.077212},{"name":"玻璃杯","score":0.074535}],"music_name":"","origin_status":0,"password_v2":"","font_id":0,"title_style":"","rich_text_title":"","enable_download":1,"cover_thumb":"https://ss-mpvolc.meipian.me/users/277375908/6e3bb499ede281b56d9e115dcbe63eb1__jpg.heic","has_video":true,"gift_switch":1,"enable_watermark":1,"content":{"article_id":269365252,"content":[{"audio_music_id":0,"img_height":1256,"img_url":"https://ss-mpvolc.meipian.me/users/277375908/6e3bb499ede281b56d9e115dcbe63eb1__jpg.heic","img_width":1080,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjc3Mzc1OTA4LzZlM2JiNDk5ZWRlMjgxYjU2ZDllMTE1ZGNiZTYzZWIxX19qcGcuaGVpYw==/nickname/6K-X6K-X/userid/Mjc3Mzc1OTA4/sign/4584e31aa3399e64c6608963e8725dfa"},{"audio_music_id":0,"source":0,"text":"
为深入实施《全民科学素质行动计划纲要》,培养青少年科学兴趣、提升科学素养、增强创新精神,青州市圣水学校积极响应号召,根据学校的实际情况设计了适合低年级的科学小实验。
根据我们提供的小实验,同学们积极踊跃的选择了自己喜欢的小实验并认认真真的完成了整个实验过程。实验过程中有的同学用图片表现,也有的同学以视频解说的方式向我们显示了整个实验过程。
小小实验激发了同学们的大大兴趣。接下来我们就欣赏一下孩子们的作品吧。
所需材料:
白纸、水彩笔、剪刀、一盆清水
实验步骤:
(1)在白纸上画几朵漂亮的小花;
(2)用剪刀把小花剪下来;
(3)将花瓣向着花心折起来,做成含苞待放的样子;
(4)将折好的“花苞”平稳地放入清水中。
实验现象:
折起来的小花张开了。
实验原理:
这是毛细现象,纸张中含有大量的植物纤维,里面有细小的毛细管,当水渗入纸张的纤维后,纤维会膨胀,使得纸张会沿着折位张开,于是就出现了类似花开的效果。不同类型的纸在实验中的效果是不同的,这是因为不同材质的纸,吸水性也不同,所以小花“盛开”的速度就有快有慢了。
注意事项:
小朋友们可以自由发挥,画自己喜欢的各种各样的小花。还有,在使用剪刀时一定要注意安全哦。
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一根吸管、两只透明玻璃杯、果汁
实验步骤:
(1)首先,在一只玻璃杯中倒满果汁;
(2)用剪刀将吸管剪成U型;
(3)将U型吸管浸入杯中装满果汁,然后用手指按住管口;
(4)将吸管架在两只杯子的杯壁上方,放开手指。
实验现象:
这时果汁顺着吸管流了出来,直到两只玻璃杯液面齐平才停止,刚好满足一半的要求。
实验原理:
该实验是经典的虹吸现象,吸管内装入橙汁后,最高点液体会在重力作用下往低位管口处移动,在U型管内部产生负压,导致左边杯子里的果汁被吸进最高点,流入右边的杯子,直至两者的液面高度达到平衡,果汁才会停止流动。
注意事项:
小朋友们在使用剪刀剪吸管时要注意安全,小心划伤哦。
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一个醋杯、一根棉签、一张白纸、一个打火机或一根火柴、一支蜡烛。
实验步骤:
(1)用蘸醋的棉签在白纸上写下你想写的字。
(2)写好后自然风干,字迹消失了。
(3)点燃蜡烛,并将刚才写字的地方在火上烤一烤(纸和外焰之间约0.5cm)。
(4)字迹重新出现了。
实验原理:
由于白醋是没有颜色的,将白醋涂在白纸上并风干之后,纸面上就无法看到刚才写的字。当把刚才写有字的白纸在蜡烛上方烘烤时,由于纸片被加热,白醋使纸的纤维加速碳化,变成了红褐色,此时刚才写的字就显现出来了。
注意事项:
在烘烤白纸时,请特别注意火焰与纸的距离,不要把纸张烧着,避免产生火灾隐患。同时,实验过程中使用了打火机、蜡烛等易燃易爆物品,需特别注意用火安全。实验过程需大人全程陪伴,不能由孩子单独操作,确保安全!
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根据我们提供的小实验,同学们积极踊跃的选择了自己喜欢的小实验并认认真真的完成了整个实验过程。实验过程中有的同学用图片表现,也有的同学以视频解说的方式向我们显示了整个实验过程。
小小实验激发了同学们的大大兴趣。接下来我们就欣赏一下孩子们的作品吧。
所需材料:
白纸、水彩笔、剪刀、一盆清水
实验步骤:
(1)在白纸上画几朵漂亮的小花;
(2)用剪刀把小花剪下来;
(3)将花瓣向着花心折起来,做成含苞待放的样子;
(4)将折好的“花苞”平稳地放入清水中。
实验现象:
折起来的小花张开了。
实验原理:
这是毛细现象,纸张中含有大量的植物纤维,里面有细小的毛细管,当水渗入纸张的纤维后,纤维会膨胀,使得纸张会沿着折位张开,于是就出现了类似花开的效果。不同类型的纸在实验中的效果是不同的,这是因为不同材质的纸,吸水性也不同,所以小花“盛开”的速度就有快有慢了。
注意事项:
小朋友们可以自由发挥,画自己喜欢的各种各样的小花。还有,在使用剪刀时一定要注意安全哦。
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一根吸管、两只透明玻璃杯、果汁
实验步骤:
(1)首先,在一只玻璃杯中倒满果汁;
(2)用剪刀将吸管剪成U型;
(3)将U型吸管浸入杯中装满果汁,然后用手指按住管口;
(4)将吸管架在两只杯子的杯壁上方,放开手指。
实验现象:
这时果汁顺着吸管流了出来,直到两只玻璃杯液面齐平才停止,刚好满足一半的要求。
实验原理:
该实验是经典的虹吸现象,吸管内装入橙汁后,最高点液体会在重力作用下往低位管口处移动,在U型管内部产生负压,导致左边杯子里的果汁被吸进最高点,流入右边的杯子,直至两者的液面高度达到平衡,果汁才会停止流动。
注意事项:
小朋友们在使用剪刀剪吸管时要注意安全,小心划伤哦。
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一个醋杯、一根棉签、一张白纸、一个打火机或一根火柴、一支蜡烛。
实验步骤:
(1)用蘸醋的棉签在白纸上写下你想写的字。
(2)写好后自然风干,字迹消失了。
(3)点燃蜡烛,并将刚才写字的地方在火上烤一烤(纸和外焰之间约0.5cm)。
(4)字迹重新出现了。
实验原理:
由于白醋是没有颜色的,将白醋涂在白纸上并风干之后,纸面上就无法看到刚才写的字。当把刚才写有字的白纸在蜡烛上方烘烤时,由于纸片被加热,白醋使纸的纤维加速碳化,变成了红褐色,此时刚才写的字就显现出来了。
注意事项:
在烘烤白纸时,请特别注意火焰与纸的距离,不要把纸张烧着,避免产生火灾隐患。同时,实验过程中使用了打火机、蜡烛等易燃易爆物品,需特别注意用火安全。实验过程需大人全程陪伴,不能由孩子单独操作,确保安全!
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