1、Unit 9 Was I a good girl back then?When I was a baby,I was very soft(柔软柔软)and lived in the water.I had one long tail and no legs.I looked like a comma(逗号逗号).Now I am a strong adult,I can jump very fast with my four strong legs,I like croaking at night.use simple past 过去时过去时 tense.When I a baby,I ver
2、y soft and in the water.I one long tail and no legs.I like a comma(逗号逗号).was(am,was)(was,am)was(lived,live)lived(had,have)had(looked,look)lookedNow I a strong adult,I jump very fast with my four strong legs,I croaking at night.canlike(am,was)(can,could)(liked,like)use simple present tense 用现在时用现在时am
3、Who am I a duckBefore he was years old,he in the playground.sevenliked But now he is years old,he in the playground.footballeighteen likes playingplayingbasketballWhen he was year old,he But now he five liked watching TV.likes surfing the Internet.Before,she But now she liked watching cartoons.likes
4、 drawing cartoons.Before he liked playing with toys.But now he likesreading books.Before,But now he liked eating candy.he likes eating vegetables.Before she often cried.But now she always smiles.Homework本文主要叙述了贝利的父亲本文主要叙述了贝利的父亲成功的教育成功的教育贝利戒烟的故事贝利戒烟的故事。一、回顾主要内容:一、回顾主要内容:二、新课学习二、新课学习1 1、“吸烟有害健康吸烟有害健康”
5、是众所周知的常识,你是众所周知的常识,你觉得贝利知道吗?(用觉得贝利知道吗?(用单曲线单曲线画出画出1-31-3段中描段中描写贝利的语句后说说你的看法。)写贝利的语句后说说你的看法。)从贝利的言行中你能揣摩出他当时的心理从贝利的言行中你能揣摩出他当时的心理状态吗?状态吗?2 2、贝利回家后,父亲都教育了他什么?是以怎贝利回家后,父亲都教育了他什么?是以怎样的态度和做法教育的?透过这些,你看到了样的态度和做法教育的?透过这些,你看到了一位怎样的父亲?结合课文中对父亲言行的描一位怎样的父亲?结合课文中对父亲言行的描写进行说明。写进行说明。(要求:用(要求:用横线画出横线画出相关的词语或相关的词语或
6、句子,并且句子,并且进行批注进行批注)3、在父亲的循循善诱之下,贝利的心理发生怎样的变、在父亲的循循善诱之下,贝利的心理发生怎样的变化?请你结合全文认真揣摩分析。化?请你结合全文认真揣摩分析。你觉得贝利是一个怎样的少年?你觉得贝利是一个怎样的少年?(用单曲线画出相关依据并批注。)。)三、探究主题三、探究主题 这无疑是一次成这无疑是一次成功的教育,你认为贝功的教育,你认为贝利能成功戒烟的利能成功戒烟的原因原因有哪些?有哪些?四、拓展延伸四、拓展延伸 作为中学生的我们,时时刻刻都在接受着教育。作为中学生的我们,时时刻刻都在接受着教育。我们既然认识到了一次成功的教育既源于教育者也我们既然认识到了一次
7、成功的教育既源于教育者也源于被教育者,那么就请你从自己的角度谈一谈源于被教育者,那么就请你从自己的角度谈一谈自自己应该怎样做才能使所受的教育更加成功己应该怎样做才能使所受的教育更加成功。五、小结祝愿:五、小结祝愿:英国作家赫胥黎英国作家赫胥黎曾说过:曾说过:“宇宙中只宇宙中只有一个角落是你一定有一个角落是你一定能够改善的,那就是能够改善的,那就是你自己。你自己。”希望同学们在接希望同学们在接受师长教育的同时,受师长教育的同时,一定一定像贝利一样像贝利一样学会教育你自己学会教育你自己。六、作业六、作业语文书语文书7777页页“探究和练习探究和练习”三、三、1.2.3.41.2.3.4星期星期一一
8、二二三三四四五五六六日日最低温度最低温度(0 0C)C)-1-3-2-1-2-3-2沈阳这一周最低气温的平均值是多少?沈阳这一周最低气温的平均值是多少?大家好!大家好!随着季节的变化,沈阳这一周的最低气温如下:随着季节的变化,沈阳这一周的最低气温如下:(8)(2)=请直接写出下列各式的结果:请直接写出下列各式的结果:(10)5=9(3)=0(12)=观察上面的算式及计算结果,你发现了什么?观察上面的算式及计算结果,你发现了什么?63=24-3-20与同组同学交流,请再举一些例子验证你们的发现。与同组同学交流,请再举一些例子验证你们的发现。原数原数-14 -1.25-110倒数倒数你能说出下列各
9、数的倒数吗你能说出下列各数的倒数吗471417454-1-11 1没有没有43(-3)(-(-3)计算:计算:(-3))34()34(=4334 课堂小结课堂小结本节课你学习了什么?本节课你学习了什么?发现了什么发现了什么?有什么收获?有什么收获?还有什么问题?还有什么问题?布置作业布置作业课本课本57页页2、3、4题题第三章第三章整式及其加减整式及其加减 课课前前热热身身随随堂堂演演练练2代数式代数式 基础训练基础训练课前热身课前热身(5分钟分钟)基础训练基础训练随堂演练随堂演练(10分钟分钟)谢谢观赏!谢谢观赏!Thanks!http:/ 中小学课件站中华民族的 最强音http:/ 中小学
10、课件站中华人民共和国国歌起来!不愿做奴隶的人们!把我们的血肉筑成我们新的长城!中华民族到了最危险的时候,每个人被迫着发出最后的吼声。起来!起来!起来!我们万众一心,冒着敌人的炮火,前进!冒着敌人的炮火,前进!前进!前进!进!义勇军进行曲 http:/ 中小学课件站奴隶奴隶 剧本剧本 谱曲谱曲 自豪感自豪感 气概气概 魔爪魔爪 压迫压迫 侵占侵占弹弹琴琴 尤其尤其 歌词歌词 嫉嫉妒妒油然而生油然而生 万众一心万众一心 振奋人心振奋人心催人奋进催人奋进 勇往直前勇往直前 警钟长鸣警钟长鸣豁然开朗豁然开朗 居安思危居安思危 繁荣富强繁荣富强 http:/ 中小学课件站默读第三自然段,完成填空1 1、
11、“中华民族的最强音中华民族的最强音”,指的是(,指的是()2 2、义勇军进行曲诞生在(、义勇军进行曲诞生在()年。)年。3 3、义勇军进行曲的词作者是(、义勇军进行曲的词作者是(),曲作者),曲作者是(是()4 4、义勇军进行曲最初是电影(、义勇军进行曲最初是电影()的主题曲。)的主题曲。5 5、课文里的、课文里的“敌人敌人”指的是(指的是()http:/ 中小学课件站 日本帝国主义在我们的土地上胡作非日本帝国主义在我们的土地上胡作非为,烧毁房屋,抢走财产,最可恨的是成为,烧毁房屋,抢走财产,最可恨的是成千上万无辜的老百姓被残杀,他们所到之千上万无辜的老百姓被残杀,他们所到之处尸横遍野、血流成
12、河。人民颠沛流离,处尸横遍野、血流成河。人民颠沛流离,流离失所。流离失所。http:/ 中小学课件站 聂耳看到这振奋人心的歌词,激发起极大的创作热聂耳看到这振奋人心的歌词,激发起极大的创作热情,立即动手谱曲。他把自己关在简陋的住房里,一会情,立即动手谱曲。他把自己关在简陋的住房里,一会儿弹琴,一会儿高唱,一会儿按着节拍走动。他把对祖儿弹琴,一会儿高唱,一会儿按着节拍走动。他把对祖国和人民的爱,对敌人的恨,都倾注到每一个音符中。国和人民的爱,对敌人的恨,都倾注到每一个音符中。这首歌高昂激越,催人奋进,尤其是结尾句:这首歌高昂激越,催人奋进,尤其是结尾句:“我们万我们万众一心,冒着敌人的炮火,前进
13、!前进!前进!进!众一心,冒着敌人的炮火,前进!前进!前进!进!”坚定有力,反映了中国人民在反侵略战争中万众一心、坚定有力,反映了中国人民在反侵略战争中万众一心、勇往直前、誓死保卫祖国的伟大精神,唱出了中华民族勇往直前、誓死保卫祖国的伟大精神,唱出了中华民族的最强音。的最强音。http:/ 中小学课件站同学们,在战争年代国歌体现了中华民族万众一心、同学们,在战争年代国歌体现了中华民族万众一心、勇往直前、誓死保卫祖国的最强音。在现今,当我们勇往直前、誓死保卫祖国的最强音。在现今,当我们国家取得巨大荣誉和成就的时刻,中华儿女又应该用国家取得巨大荣誉和成就的时刻,中华儿女又应该用自己怎样的方式奏响了
14、中华民族的最强音呢?自己怎样的方式奏响了中华民族的最强音呢?大家能举一些典型例子吗?大家能举一些典型例子吗?http:/ 中小学课件站 5月月12日汶川大地震,中华儿女众志成城、抗震救灾,奏响了中华民日汶川大地震,中华儿女众志成城、抗震救灾,奏响了中华民族的最强音族的最强音“中国加油!四川加油中国加油!四川加油”!2008年奥运会,中国健儿奋力拼搏,夺得金牌年奥运会,中国健儿奋力拼搏,夺得金牌51枚,会场里一次又枚,会场里一次又一次地奏响国歌,运动员流下激动的眼泪。一次地奏响国歌,运动员流下激动的眼泪。神舟七号载人航天,实现了我国在太空的行走。这一步跨越,独步神舟七号载人航天,实现了我国在太空
15、的行走。这一步跨越,独步寰宇,这一刻历史,铭刻辉煌,这一刻奏响了中华民族的最强音。寰宇,这一刻历史,铭刻辉煌,这一刻奏响了中华民族的最强音。Unit 2 A country life is a healthy life广州市黄埔区文船小学广州市黄埔区文船小学 钟子刚钟子刚Look and saycount country a country lifelike life ride ill still red freshmake take air hair clean air head healthygrand grandparent fresh fooda.m.=morning p.m.=eve
16、ningmilk the cows ride my bike help my parents with other houseworkstill much work to do a healthy life plenty of exercise plenty of fresh milkWhere does Li Wei live?He lives on the farm.He love living in the country.Is he usually busy?Yes.He is usually very busy.When does Li Wei wake up every morin
17、g?He wakes up at 5 a.m.What does Li Wei do every morning?He helps his father milks the cows.milk the cowHow many pupils are there in Li Weis school?There are 48 pupils.What does he have for breakfast?He has plenty of fresh milk for breakfast.How does Li Wei go to school every day?He goes to school b
18、y bike.He rides his bike to school.Li WeiWhat does Li Wei do after school?He gets home and does still much work to do after school.Why doesnt Li Wei feel tired?Because he has plenty of exercise,clean air and fresh food every day.Unit 3New Words teach v.教;讲授 quite adv.非常;十分 nervous adj.紧张的;不安的 comfor
19、table adj.舒服的 relaxed adj.轻松的;放松的 helpful adj.有用的;有帮助的Listening1.Listen and write true(T)or false(F).1.Jane arrived in China last week.()2.Everyone is friendly and nice to Jane.()3.Canadian students dont move to different classrooms for their classes.()Listen and answer 4.Janes students teach her ab
20、out their culture.()1.Listen and write true(T)or false(F).1.Jane arrived in China last week.()2.Everyone is friendly and nice to Jane.()3.Canadian students dont move to different classrooms for their classes.()4.Janes students teach her about their culture.()Check the answersFTFTHello,everyone!How a
21、re you?Im doing well.Life in China is great!I arrived two months ago.I was quite nervous then.But everyone here is so friendly and nice.Now I feel quite comfortable and relaxed.My students are wonderful and the other teachers are always helpful.Jane is from Canada.She is teaching English in China.Sh
22、e is writing an e-mail to her family and friends back home.My school is very big.I have many students in my class.In Canada,there are usually only 35 students in a class.And they move from classroom to classroom for their classes.But in China,the teachers move!Chinese students work very hard.They us
23、ually start school at 8:00 a.m.and finish at 5:00 p.m.Chinese teachers work very hard,too.Im so happy to be in China.I am learning so much here.My students often teach me Chinese.They also teach me about their culture.Its so interesting!I visited the Great Wall last month.Look at my picture.Wo ai Zh
24、ongguo!I miss you all!JaneMaking a difference means making a good change.You can make a difference in your own life and in others lives too.Do you know anyone who makes a difference?How can you make a difference?Are schools in China an Canada the same?Read the lesson and list some differences betwee
25、n Chinese and Canadian schools.2ChinaCanadaTeachers moved from classroom to classroom for their class.Students moved from classroom to classroom for their class.Fill in the blanks with words in the box.3nervous friendly relaxed wonderful teach1.I didnt know anyone at the party.But everyone was very
26、_.2.Spring is nice and warm.It is a _ season.3.Li Ming is going to give a talk.He is quite _.4.Im a teacher.I _ music at a middle school.5.After a busy day,I like to sit and drink a cup of tea.It makes me feel _.wonderful friendlynervousteachrelaxedWork in groups.Interview your classmates and fill i
27、n the table.4 Example:A:Do you do your homework?B:Yes.I always do my homework.A:Do you help out at home B:Yes.I sometimes wash the dishes.NameDo your homeworkHelp out at homeWalk to schoolPlay spotsalways often usually sometimes never Language points My students often teach me Chinese.【解析解析】句式句式teac
28、h somebody something意为意为“教教某人某事某人某事”。e.g.【解析解析】表示表示“教某人做某事教某人做某事”用句式用句式teach somebody to do something。Who taught you English last year?去年谁教你们英语?e.g.Li Ming,can you teach me to play basketball?李明,你能教我打篮球吗?Exercises!1.I felt n_ and didnt know what to do.2.After a good rest,he felt relaxed and c_.3.Thi
29、s dictionary is h_ to our English study.4.Mr.Liu is a good teacher.He t_ us English last term.5.Classes b_ at eight in the morning every day.I.根据句意和所给的首字母用适当的词语填空。根据句意和所给的首字母用适当的词语填空。ervousomfortableelpful aughtegins1._ is everything going?Very well.2._ did you go to the Great Wall?Last week.3._ did
30、nt he come to the meeting?Because he missed the bus.4._ did you learn in class this morning?To make model planes.5._ did you visit last month?The Palace Museum.II.根据上下句意用适当的疑问词填空。根据上下句意用适当的疑问词填空。HowWhenWhyWhatWhereNew WordsListening1.Listen to the statements and number the pictures.Listen and answer
31、Check the answers1.Listen to the statements and number the pictures.What club is right for you?Read the following questions.Which answer describes you best?Circle it.Then add up your score and find out your club type!1.Do you get enough exercise?a.Always!I love playing sports.b.Not really.I like to
32、listen to music and relax.c.Not really.I usually draw and paint in my free time.d.Never.I like to read books and exercise my mind.2.What is your favourite school subject?a.P.E.I like to be active.b.Music.I like to play an instrument.c.Art.I love to draw and paint.d.English and Chinese.I enjoy readin
33、g and writing.3.What do you do on a cold and snowy day?a.I cant sit quietly.I must do something active inside.b.I stay in my room and listen to music or play an instrument.c.I paint or draw a picture.d.I read a book or write a story.4.You are going on a trip.But you can only take one thing with you.
34、What do you take?a.Running shoes.I cant go anywhere without them.b.A music player.I cant live without music.c.Some paper and a pencil.I can draw a picture on the way.d.A good book.I will be bored without a book.Not look at your answers!3 or more“a”Sports3 or more“b”Music3 or more“c”Art3 or more“d”Re
35、adingOr maybe you are in the middle!Foe example:2”a”+2”b”Sports and MusicSometimes,very old people cant take care of themselves.So they go to an Old Age Home.They can get help there and meet new friends.Read the lesson and find out your club type.Then write about it.2 My club type is _.I like _ _Wor
36、k in groups.Whats your club type?Interview your classmates and fill in the form.3 Example:Name:JackWhat is your club type?MusicWhat do you like to do?I like o play the guitar.Are you in a club now?Yes NoIf“No”,do you want to join a club?Yes.What club do you want to join?I want to join a music club.I
37、f“Yes”,what club are you in?_ Language points1.What do you do on a cold and snowy day?【解析解析】表示表示“在在样的日子样的日子/上午上午/下午下午/晚上晚上”时,介词用时,介词用on。e.g.We had a club meeting on sunny morning.我们在一个晴朗的上午召开了俱乐部会议。2.I cant go anywhere without them.【解析解析】without prep.“没有;不用没有;不用”,后面接名词、动名词或后面接名词、动名词或人称代词的宾格形式。常位于句尾,
38、位于句首时,常用逗号与人称代词的宾格形式。常位于句尾,位于句首时,常用逗号与主句隔开。主句隔开。e.g.Danny hurried off without having breakfast.丹尼没有吃早饭就匆匆的走了。Without your help,I couldnt finish my project.没有你们的帮助我是完不成我的项目的。Exercises!1.He drew two _(圆)on the paper.2.I will be _(空闲的)this weekend.3.Nothing can live _(没有)air or water.4.The teacher gave
39、 us two _(范例)in class.5.All of them were _(积极的)when cleaning the classroom.I.根据括号中所给的汉语用适当的词语填空。根据括号中所给的汉语用适当的词语填空。circlesfreewithoutexamplesactive1._ is your favourite subject?English,of course.2._ did you go to Tokyo?By ship.3._ are you in this club?For half a year.4._ are you going to spend your
40、holiday?In Qingdao.5._ blouse do you like better,the red one or the purple one?The purple one.II.根据所给汉语完成英语句子,每空一词。根据所给汉语完成英语句子,每空一词。WhatHowHow longWhereWhich HomeworkHomeworkChoose a club type and make an advertisement for it.Example:Art Club Do you like to draw or paint?Join the Art Club!Drawing a
41、nd painting is fun for everyone.Join us after school and have a great time!义务教育课程标准实验教科书鲁教版数学六年级上册义务教育课程标准实验教科书鲁教版数学六年级上册用字母表示数用字母表示数 4.小聪的家离学校小聪的家离学校s千米千米,小聪骑车上学小聪骑车上学,若每时行若每时行10千千米米,则需则需 小时小时,若每小时行若每小时行v千米千米,则需则需 时时.5.a(a.a(a0)0)的倒数是的倒数是 ,a a的相反数是的相反数是 .6.乘法分配律用字母的式子表示乘法分配律用字母的式子表示 .10svsa1-a-a1.比
42、比x x少少2525的数是的数是 .2.n n的的5 5倍与倍与m m的差是的差是 .3.原价原价a a元的产品打八折的价钱是元的产品打八折的价钱是 元。元。x-25x-255n-m5n-m0.8a0.8a(a+b)c=ac+bc 小明周末跟妈妈从家出发,走了小明周末跟妈妈从家出发,走了200200米,到了报亭买了一份报纸,花了米,到了报亭买了一份报纸,花了x元,又走了元,又走了m m米,米,来到菜市场买菜。妈妈购买了来到菜市场买菜。妈妈购买了2 2千克白菜,千克白菜,1 1千克芹菜,千克芹菜,1.51.5千克豆角,已知白菜的单价千克豆角,已知白菜的单价是是a a元元/千克,芹菜的单价是千克,
43、芹菜的单价是b b元元/千克,豆角的单价是芹菜的千克,豆角的单价是芹菜的2 2倍,小明便想出这样几个倍,小明便想出这样几个式子式子(1)200+m(2)b-a(3)2b你知道小明所想的这几个式子表示什么意思吗?你知道小明所想的这几个式子表示什么意思吗?你还能根据题意提出哪些数学问题?然后用含有字母的式子表示出来你还能根据题意提出哪些数学问题?然后用含有字母的式子表示出来想一想,说一说,做一做想一想,说一说,做一做根据图形,你能提出哪些问题?并用含有字母的式子表示出来根据图形,你能提出哪些问题?并用含有字母的式子表示出来abb思考题思考题1个正方形用4根火柴棒2个正方形用_火柴棒3个正方形用 火
44、柴棒.探探 索索如图:按下列格式用火柴棒搭建正方形7根10根X个正方形用 _ 火柴棒第一个正方形用4根火柴,以后每增加一个正方形就增加根火柴,搭建x个正方形需要火柴 根。4+3(x1)解析解析:方法一:方法一上面一行和下面一行各用了上面一行和下面一行各用了x x根,竖方向用(根,竖方向用(x+1)x+1)根,根,共用了共用了 根根x+x+(x+1)解析解析:方法二:方法二解析解析:方法三:方法三先摆一根火柴,然后开始每摆一个正方形增加根火先摆一根火柴,然后开始每摆一个正方形增加根火柴,搭建柴,搭建x x个正方形需要火柴个正方形需要火柴 根根1+3x1+3x解析解析:方法四:方法四每摆一个正方形
45、用每摆一个正方形用4 4根火柴,根火柴,搭建搭建x x个正方形个正方形重复重复用了用了 根火柴,实际需要火柴根火柴,实际需要火柴 根。根。X-1X-1+4x1.本节课我学到了本节课我学到了2.我还想提的问题是我还想提的问题是3.我没弄懂的地方有我没弄懂的地方有.4.学过这节课后我的感想是学过这节课后我的感想是学习反思训练卡学习反思训练卡 你知道最早有意识地系统使用你知道最早有意识地系统使用 字母来表示数的人是谁吗?他就字母来表示数的人是谁吗?他就 是法国数学家韦达。韦达一生致是法国数学家韦达。韦达一生致 力于对数学的研究,做出了很多力于对数学的研究,做出了很多 重要贡献,成为那个时代最伟大的数
46、学家。重要贡献,成为那个时代最伟大的数学家。自从韦达系统使用字母表示数后,引出了自从韦达系统使用字母表示数后,引出了 大量的数学发现,解决了很多古代的复杂大量的数学发现,解决了很多古代的复杂 问题。问题。检测反馈检测反馈4.4.篮球每个篮球每个6868元元,足球每个足球每个4545元。某个学校买了元。某个学校买了a a个篮球,个篮球,b b个足球个足球.那么那么 68 a68 a表示表示()(),a ab b表示表示 ()(),买篮球和足球一共花了买篮球和足球一共花了()()元。元。1.1.一件衬衫一件衬衫a a元,一件毛衣的价格比它的元,一件毛衣的价格比它的2 2倍还多倍还多6 6元,毛衣的
47、价格是元,毛衣的价格是 元。元。2.2.小英家本月的用水量是小英家本月的用水量是2020立方米,交水费立方米,交水费 c c 元,那么每立方米水费元,那么每立方米水费是是_元。元。3.3.一辆公共汽车上原来有一辆公共汽车上原来有3535人,到新街车站下去人,到新街车站下去人,又上来人,又上来y y人。现人。现在车上有在车上有 人。人。A=X+Y+ZA表示成功表示成功 X表示艰苦的劳动表示艰苦的劳动 Y表示正确的方法表示正确的方法 Z表示少说空话表示少说空话爱因斯坦的成功秘决爱因斯坦的成功秘决第二章固体、液体和气体 第九节饱和蒸汽空气的湿度 高中物理选修3-3粤教版目标定位1.知道饱和蒸汽、未饱
48、和蒸汽和饱和汽压的概念2.了解相对湿度的概念和含义,认识空气的相对湿度对人的生活和植物生长的影响一、饱和蒸汽1饱和蒸汽的形成:飞出液体的分子和回到液体的分子数目达到 ,就形成了饱和蒸汽2动态平衡:从液体中飞出的分子数目与返回液体的分子数目 ,液体不会再 ,蒸汽的密度也不会再 ,达到一种动态平衡3饱和蒸汽与未饱和汽(1)饱和蒸汽:与液体处于 的蒸汽(2)未饱和汽:没有达到 的蒸汽预习导学相同 相等 减少 改变 动态平衡 饱和状态 二、饱和汽压1定义:液体的饱和蒸汽所具有的 2相关因素(1)与液体种类有关,挥发性强的液体饱和汽压大一些(2)与 有关,温度越高,饱和汽压 ,而且与饱和蒸汽的体积 预习
49、导学压强 温度 越大 无关 三、空气的湿度1绝对湿度概念:空气中所含水蒸气的 2相对湿度概念:空气中水蒸气的压强与同一温度时水的 之比预习导学压强 饱和汽压 一、对饱和汽和饱和汽压的理解1饱和汽概念:与液体处于动态平衡的蒸气2动态平衡(1)实质:密闭容器中的液体,单位时间逸出液面的分子数和返回液面的分子数相等,即处于动态平衡,并非分子运动的停止(2)特点:动态平衡是有条件的,外界条件变化时,原来的动态平衡状态被破坏,经过一段时间才能达到新的平衡课堂讲义课堂讲义3饱和汽压的决定因素(1)饱和汽压跟液体的种类有关实验表明,在相同的温度下,不同液体的饱和汽压一般是不同的挥发性大的液体,饱和汽压大(2
50、)饱和汽压跟温度有关饱和汽压随温度的升高而增大这是因为温度升高时,液体里能量较大的分子增多,单位时间内从液面飞出的分子也增多,致使饱和汽的密度增大,同时汽分子热运动的平均动能也增大,这也导致饱和汽压增大(3)饱和汽压跟体积无关在温度不变的情况下,饱和汽的压强不随体积而变化课堂讲义例1如图291所示,一个有活塞的密闭容器内盛有饱和水汽与少量的水,则可能发生的现象是()图291 课堂讲义答案B课堂讲义解析慢慢推进活塞和慢慢拉出活塞,密闭容器内体积发生变化,而温度保持不变饱和汽的压强只和温度有关,与体积无关故A错,B正确;温度不变,则饱和汽压不变,饱和汽密度不变,但由于体积增大,饱和汽分子数增加,C