"Starting from Global Warming" Material Forms and Changes PPT Courseware

Description

"Starting from Global Warming" Material Forms and Changes PPT Courseware

teaching objectives

1. Know that temperature is a physical quantity that indicates the degree of hotness or coldness of an object, and be able to tell common temperature values ​​in the living environment.

2. Understand the working principle of liquid thermometers and be able to use common thermometers to measure temperature.

3. Observe the structure of the thermometer and practice using the thermometer to measure the temperature of water.

4. Try to express your own opinions on environmental temperature issues, and have the awareness of environmental protection and sustainable development.

Course standard requirements for this chapter

1. Describe the basic characteristics of the three states of matter: solid, liquid, and gas. List the different states of matter in nature and life and their applications.

2. Name the common temperature values ​​in the living environment. Understand how liquid thermometers work and be able to use common thermometers to measure temperature. Try to express your opinion on the ambient temperature issue.

3. Experience the process of experimental exploration of changes in the state of matter, know the melting point, freezing point and boiling point of matter, and understand the endothermic and exothermic phenomena during the change of state of matter. Use the knowledge of physical state changes to explain relevant phenomena in nature and life.

4. The three-state changes in water use illustrate some water cycle phenomena in nature. Understand the status of water resources in our country and local areas, and have awareness of caring for the environment and saving water.

Detection Preview Exchange Display

1. Test preview

What is temperature? On what principle are thermometers made?

The principle of thermometer

Made based on the principle of thermal expansion and contraction of liquids.

It expands when heated and the liquid level rises.

It shrinks when exposed to cold and the liquid level drops.

2. Use a thermometer to measure the temperature of a liquid

1. Estimate the temperature of the liquid to be measured.

2. Choose the right thermometer.

Observe the thermometer’s range and graduations.

Range: The lowest and highest temperature that a thermometer can measure.

Graduation value: The value represented by one small division on the thermometer scale.

Note: Do not exceed the range of the thermometer when measuring temperature!

Correct placement:

1. The glass bubble must be in full contact with the liquid being measured, and the glass bubble must not touch the wall or bottom of the device.

2. Enough time. Wait for the thermometer to stabilize before taking a reading.

3. The reading is accurate. Do not take the thermometer out of the liquid being measured for reading; the line of sight should be perpendicular to the thermometer and level with the liquid level inside the thermometer.

Replenish:

1. The variation range of thermometers for home use is [ ]

A. 0℃～100℃． B． 35℃～42℃．

C. -10℃～100℃． D． -20℃～50℃．

2. Use the same thermometer to measure the temperature of water at 0°C and ice-water mixture at 0°C. Which of the following statements is correct? [ ]

A. 0℃ water temperature is high

B． The temperature of the ice-water mixture at 0°C is high

C. Both have the same temperature

D． Can't compare

3. Regarding the use of commonly used thermometers below, the incorrect one is [ ]

A. A thermometer cannot be used to measure temperatures above its maximum scale;

B． The glass bulb of the thermometer must be in full contact with the object being measured;

C. When measuring the temperature of a liquid, the thermometer glass bulb must be completely immersed in the liquid;

D． When taking a reading, remove the thermometer from the liquid and take another reading.

summary:

1. Thermometer: structure and principle, range, graduation value and method of use.

2. Thermometer: structural features and usage.

Operation:

Classwork: Questions 1, 2, 3, 4, and 5 on page p86.

Tutorial (preview):

a. What are vaporization and liquefaction? Know that vaporization absorbs heat and liquefaction releases heat. List three examples of vaporization and liquefaction phenomena in daily life.

b. What is evaporation? What are the factors that affect the speed of evaporation? Know the phenomenon of boiling and the characteristics of boiling, and know what the boiling point is.

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For more information about the PPT courseware "Material Forms and Their Changes from the Global Warming Points", please click the Material Forms and Their Changes ppt from the Global Warming Points tab.

"Starting from Global Warming" Material Forms and Changes PPT Courseware 2:

"Starting from Global Warming" Material Forms and Changes PPT Courseware 2 Learning Objectives 1. Understand the concept of temperature and be able to name common temperature values ​​​​in daily life and the natural environment 2. Know how to use a thermometer and be able to use a thermometer Measuring Temperature 3. Learn some measurements..

File Info

Update Time: 2024-11-16

This template belongs to Physics courseware Guangdong and Shanghai version of eighth grade physics volume one industry PPT template

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