How to use Nanshannan to import temperature changes

Hello, dear judges and teachers! I am today's candidate No. 3. The topic of my trial lecture is "Changes and Distribution of Temperature". Let’s start my trial lecture.

2. Introduction

Lecture. Hello students, please take a seat.

Let’s take a look at these two pictures (street scene photos of people in Liaoning and Hainan). Students, we can see from the picture that in September, why on the streets of Liaoning, people wore long pants and shirts, but on the streets of Hainan, people wore shorts and vests. Think about it. Why?

Okay, some students said this is because the temperatures in the two places are different. Yes, temperature is a big concern for all of us. We pay attention to the weather forecast every day, is it because changes in temperature have a great impact on our lives? Why are the temperatures different? Think about it, everyone. Some students said that the temperature varies with time. In spring, summer, autumn and winter, the temperature changes in each season of the year; the temperature also changes from morning to night throughout the day. Some students said that the temperature changes due to different spaces. The temperature in the south and the north is different at the same time, that is, the temperature in the temperate zone, the tropics, and the cold zone is also different.

So, do you know how to observe the temperature? How to calculate the daily average temperature and how to read the annual temperature change curve? Can you read isotherm maps and summarize the distribution characteristics of world temperatures? Today we will learn the knowledge related to these issues together - the changes and distribution of temperature.

3. New teaching part

Ask students to open the textbook and give you five minutes to look at the pictures in the textbook and think about how the daily average temperature should be calculated? How are the monthly average temperature and annual average temperature calculated? OK, time's up! Please tell me about the male student wearing blue clothes leaning against the wall. He said that he first uses a ruler to compare with the scale on the picture, observes and reads out the temperature values ​​at four times of the day, then adds the four temperature values ​​and divides by 4, the daily average temperature is obtained. By analogy, in a month or a year, we only need to find several sample values, add them up and average them, and then we can get the corresponding monthly average temperature and annual average temperature. Our classmates’ ideas are very clear! Please take a seat!

Next, let’s think about it. When we arrive at school in the morning, we wear coats, but do we not need to wear coats when doing recess exercises in the morning? What does this mean? I heard my classmates say it's because the temperature changes every day.

Let’s take a look at this picture. This is a diurnal temperature change picture. When we look at the picture, we must pay attention to the picture name, coordinates, and the highest and lowest points. Okay, let me tell you, the female student in the front row, when are the highest and lowest points of the day? Well, she said the high was at 2pm at 31 degrees Celsius and the low was at 4am at 23.5 degrees Celsius. OK, please take a seat. So, what is the difference between the highest temperature and the lowest temperature in a day, and the difference between the lowest temperature and the highest temperature? Everyone is ready to answer the questions. They have previewed the text well. Yes, the temperature is getting worse day by day. From this, we can also derive the annual temperature range.

Now let’s learn how to draw a graph of annual changes in temperature. First, observe the approximate distribution of temperatures in those intervals, and roughly set each interval. Draw the abscissa and divide it evenly into 12 segments, representing January to December respectively, and mark the months from left to right; draw the ordinate, and determine the value range of the ordinate based on the values ​​of the highest temperature and the lowest temperature as - 25℃~25℃, bisect the ordinate with a scale of 5℃; then trace each point on it, and finally connect it with a smooth curve. Next, the four students were divided into groups, and the whole class was divided into ten groups to discuss how to draw this picture. (Walks off the podium) How is our group doing? We need to read the scale values ​​carefully and draw them carefully. Continue.

Okay, the time is up, we invite the first group of students to come up and draw a picture. (A classmate draws a picture on the blackboard) He draws well! Please return to your seat. Is there any other classmates who would like to give it a try? That’s great! The second group sent a representative to come up and draw a picture. (Students draw pictures). Well, both students draw well.

4. Summary

Students, recall what we have learned today? Which classmate takes the initiative to share what he has learned? Please tell me, the student in the last row with the highest hand, how to read the temperature value, how to calculate the daily average temperature, and what else?

Yes, changes in temperature. Please sit down and listen to the class very seriously! In addition to these, we all also worked together to draw a curve chart of temperature changes.

5. Homework Part

Based on today’s course, the teacher will leave you with a homework. We can keep watching the weather forecast, record the temperature of our city for a week, and find the average temperature. , you can also draw a curve graph of the temperature.

Okay, that’s the end of today’s class. get out of class is over!

6. Ending

Thank you all the judges and teachers, my trial lecture is over.