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2026人教版四年级科学下册(全册)教案

  • 2026-06-23 03:49:47
2026人教版四年级科学下册(全册)教案
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第一单元 天气与气候

一天的气温

风向和风力

观测云和雨

气候和气象灾害

第二单元 养蚕

蚕出生了

怎样养蚕

蚕的生长变化

蚕的一生

第三单元 环境中的生物

生物与非生物

10 不同环境中的植物

11 不同环境中的动物

第四单元 地球 太阳 月球

12 认识地球的形状

13 太阳和月球

14 月相的变化

第五单元 影子的变化

15 会变的影子

16 阳光下的影子

第六单元 简易计时器

17 认识简易计时器

18 制作日晷

资料部分展示

第一单元 天气与气候

一天的气温

一、基本信息

  • 学科:科学
  • 年级:四年级下册
  • 单元:第一单元      天气与气候
  • 课题:一天的气温
  • 课时:课时

二、教学目标

(一)科学观念

  1. 知道气温是指空气的冷热程度,单位是摄氏度(
  2. 知道天气预报的气温是在室外阴凉、通风、距地面 1.5 处测得。
  3. 知道一天中气温先升高后降低,最高温出现在14 时左右,最低温在清晨

(二)科学探究

  1. 正确使用气温计测量、读数、记录。
  2. 能根据一天气温数据绘制折线图,并归纳变化规律。

(三)科学态度

  1. 认真测量、如实记录,尊重数据。
  2. 愿意合作交流,乐于长期观测。

(四)STSE

初步体会长期观测对气象研究的意义,关心天气与生活。

三、教学重难点

  • 重点
    :正确使用气温计,测量并记录一天气温。
  • 难点
    :绘制折线图,分析并准确表述一天气温变化规律。

四、教学准备

  • 教师:气温计、课件、气温记录表、折线图空白模板、百叶箱图片。
  • 学生:每组气温计、记录单、铅笔、尺子。

五、教学过程

(一)导入新课(分钟)

  1. 提问:今天冷还是热?我们用什么表示冷热?
  2. 揭题:空气的冷热程度叫气温,今天学习《一天的气温》。

(二)认识气温计与正确使用(12分钟)

  1. 认识气温计:玻璃泡、液柱、刻度、单位
  2. 教师示范 + 学生记忆口诀:
    • 一放
      :阴凉通风、距地面 1.5 米、不晒太阳。
    • 二等
      :液柱稳定再读。
    • 三平
      :视线与液柱顶端相平。
    • 四读
      :零上往上数,零下往下数。
  3. 小组练习:测量室内气温,互查读数。

(三)测量并记录一天的气温(15分钟)

  1. 讨论:在哪里测?什么时候测?
    • 测量地点:室外阴凉通风处(统一地点)。
    • 测量时间:8:0010:0012:0014:0016:00
  2. 出示记录表,小组分工记录。
  3. 教师巡视纠正:不手持玻璃泡、不阳光直射。

(四)绘制折线图 & 分析规律(10 分钟)

  1. 绘图方法:
    • 横轴:时间
    • 纵轴:温度
    • 描点连线标数据
  2. 观察讨论:
    • 一天气温怎么变?(先升后降)
    • 最高温在几点?(14 时左右)
    • 为什么中午不是最热?(地面吸热需要时间)
  3. 小结规律:清晨最低逐渐升高→14 时左右最高慢慢下降

(五)拓展:气象站怎么测(分钟)

展示百叶箱:通风、避光、统一高度,保证数据公平可比。

(六)课堂小结(分钟)

  • 会用气温计。
  • 知道一天气温变化规律。
  • 坚持观测,做小小气象员。

六、板书设计

一天的气温

  1. 气温
    :空气冷热程度,单位
  2. 正确测量
    • 阴凉通风、1.5 米、不暴晒
    • 液稳、平视、准确读
  3. 一天规律
    :低
    • 最高:14 时左右
    • 最低:清晨

七、作业布置

  1. 连续测量同一时间气温,记录并说说发现。
  2. 和家人分享一天气温变化规律。

八、教学反思

(课后填写)

  • 学生是否掌握气温计使用?
  • 折线图绘制是否顺利?
  • 能否独立说出一天气温变化规律?
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  1. CONNECT:[ UseTime:0.000581s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000943s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000354s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000261s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000662s ]
  6. SELECT * FROM `set` [ RunTime:0.000225s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000668s ]
  8. SELECT * FROM `article` WHERE `id` = 507198 LIMIT 1 [ RunTime:0.000465s ]
  9. UPDATE `article` SET `lasttime` = 1782250017 WHERE `id` = 507198 [ RunTime:0.013287s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000385s ]
  11. SELECT * FROM `article` WHERE `id` < 507198 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000648s ]
  12. SELECT * FROM `article` WHERE `id` > 507198 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000472s ]
  13. SELECT * FROM `article` WHERE `id` < 507198 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001695s ]
  14. SELECT * FROM `article` WHERE `id` < 507198 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003558s ]
  15. SELECT * FROM `article` WHERE `id` < 507198 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001999s ]
0.096636s