当前位置:首页>学习笔记>【26版物理步步高人教版学习笔记选择性必修第三册第二章3第2课时理想气体气体实验定律的微观解释

【26版物理步步高人教版学习笔记选择性必修第三册第二章3第2课时理想气体气体实验定律的微观解释

  • 2026-03-16 04:43:15
【26版物理步步高人教版学习笔记选择性必修第三册第二章3第2课时理想气体气体实验定律的微观解释

[学习目标]1.了解理想气体的模型,并知道实际气体看成理想气体的条件。2.掌握理想气体状态方程的内容和表达式,并能应用方程解决实际问题(重难点)。3.能用气体分子动理论解释三个气体实验定律(重点)。

一、理想气体

1.理想气体:在温度、压强下都遵从气体实验定律的气体。

2.理想气体与实际气体

实际气体在温度不低于、压强不超过时,可以当成理想气体来处理。

3.从微观的角度看,理想气体的特点

(1)气体分子与分子间距离相比忽略不计。

(2)气体分子间的忽略不计。

(3)气体分子与器壁碰撞的忽略不计。

4.理想气体是对实际气体的一种科学抽象,是一种理想化模型,实际并不存在。

一定质量的理想气体的内能与什么因素有关?

________________________________________________________________________________________________________________________________________________________________________________________二、理想气体的状态方程

如图所示,一定质量的某种理想气体从状态AB经历了一个等温过程,又从状态BC经历了一个等容过程,请推导状态A的三个参量pAVATA和状态C的三个参量pCVCTC之间的关系。

________________________________________________________________________________________________________________________________________________________________________________________

1.内容:一定的某种理想气体,在从一个状态(p1V1T1)变化到另一个状态(p2V2T2)时,压强p跟体积V的乘积与的比值保持不变。

2.表达式:=C=

公式中常量C仅由气体的决定,与状态参量(pVT)无关。

3.成立条件:一定的理想气体。

4.理想气体状态方程与气体实验定律的关系

=

1(2024·郑州市高二月考)湖底温度为,有一球形气泡从湖底升到水面(气体质量恒定)时,其直径扩大为原来的2倍。已知水面温度为27 ,大气压强p0=1×105 Pa,湖水的密度为1×103 kg/m3,g10 m/s2,则湖水深度约为(  )

A.65 mB.55 mC.45 mD.25 m

2 汽缸长为L=1 m(汽缸厚度可忽略不计),固定在水平面上,汽缸中有横截面积为S=100 cm2的光滑活塞(厚度不计)封闭了一定质量的理想气体,已知当温度为t=27 ,大气压强为p0=1×105 Pa时,气柱长为L0=0.4 m。现用水平拉力向右缓慢拉动活塞。

(1)若拉动活塞过程中温度保持27 ,求活塞到达缸口时缸内气体压强;

(2)若汽缸、活塞绝热,拉动活塞到达缸口时拉力大小为500 N,求此时缸内气体温度。

________________________________________________________________________________________________________________________________________________________________________________________

应用理想气体状态方程解题的一般步骤

1.明确研究对象,即一定质量的理想气体;

2.确定气体在初、末状态的参量p1V1T1p2V2T2

3.由理想气体状态方程列式求解;

4.必要时讨论结果的合理性。

3内径较小且均匀的L形直角细玻璃管,一端封闭,一端开口竖直向上,用水银柱将一定质量的空气封存在封闭端内,空气柱长4 cm,水银柱高58 cm,进入封闭端水银柱长2 cm,如图所示,温度是87 ,大气压强为75 cmHg,求:

(1)在如图所示位置空气柱的压强p1

(2)在如图所示位置,要使空气柱的长度变为3 cm,温度必须降低到多少摄氏度?

________________________________________________________________________________________________________________________________________________________________________________________三、气体实验定律的微观解释

从微观角度来说,气体压强由什么因素决定?

________________________________________________________________________________________________________________________________________________________________________________________

1.玻意耳定律的微观解释

一定质量的某种理想气体,温度保持不变时,分子的不变。体积减小时,分子的数密度,单位时间内、单位面积上碰撞器壁的分子数就,气体的压强就

2.盖—吕萨克定律的微观解释

一定质量的某种理想气体,温度升高时,分子的平均动能,只有气体的体积同时,使分子的数密度,才可能保持压强不变。

3.查理定律的微观解释

一定质量的某种理想气体,体积保持不变时,分子的数密度,温度升高时,分子的平均动能,气体的压强

通过网盘分享的文件:【学生用书Word版文档】整书等6个文件

链接: https://pan.baidu.com/s/1WrqhWD388uzcm3Z1gXKHEA?pwd=4321 提取码: 4321 

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  1. CONNECT:[ UseTime:0.000758s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000726s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002727s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003340s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000505s ]
  6. SELECT * FROM `set` [ RunTime:0.000212s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000562s ]
  8. SELECT * FROM `article` WHERE `id` = 473727 LIMIT 1 [ RunTime:0.000467s ]
  9. UPDATE `article` SET `lasttime` = 1773632321 WHERE `id` = 473727 [ RunTime:0.007357s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.010521s ]
  11. SELECT * FROM `article` WHERE `id` < 473727 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000828s ]
  12. SELECT * FROM `article` WHERE `id` > 473727 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.011579s ]
  13. SELECT * FROM `article` WHERE `id` < 473727 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007310s ]
  14. SELECT * FROM `article` WHERE `id` < 473727 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.013735s ]
  15. SELECT * FROM `article` WHERE `id` < 473727 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.012178s ]
0.216973s