"Temperature" Changes in State of Matter PPT

Description

"Temperature" Changes in State of Matter PPT

Part One: Preview Perception

1. Temperature and thermometer

1. Temperature.

Represents the ______________ of an object. The temperature of a hot object is ________, and the temperature of a cold object is ________.

2. Principle of thermometer.

Thermometers commonly used in homes and laboratories are based on the laws of liquid ________.

2. Temperature in degrees Celsius

1. Unit.

_________, the symbol is ℃.

2. Regulations.

Let the temperature of ________ under standard atmospheric pressure be 0 ℃, and the temperature of _________ be 100 ℃. Divide it into 100 equal parts between 0 ℃ and 100 ℃, and each part represents _________.

3. Use of thermometer

1. Measuring range.

A thermometer can measure ________ of temperature.

2. Graduation value.

The temperature value represented by ____________________.

3. How to use.

(1) Before use: See ____________________ clearly.

(2) When using:

①The glass bulb of the thermometer should be _________in the liquid being measured, __________________.

② After the glass bulb of the thermometer is immersed in the liquid to be measured, __________________, wait until the thermometer shows a reading of __________________ before reading.

③When reading, the glass bulb of the thermometer should be __________________, and the line of sight should be level with the _________ of the liquid column in the thermometer.

4. Thermometer

1. Measuring range.

__________________.

2. Graduation value.

__________________.

3. Use.

Before use, ____________________ and throw the mercury back into the glass bubble.

4. Reading.

_________Leave body readings.

Temperature PPT, part 2: interactive classroom understanding

1. How to use a thermometer

1. "Evaluate once and look twice" before use.

(1) "First estimate": Estimate the temperature of the object being measured and select a thermometer with a suitable range.

(2) "Second look": Look clearly at the range and its graduation value, in order to facilitate quick and accurate readings.

2. When using it, there are "three do's and three don'ts".

3. The icon used (as shown in the picture).

[Example 1] Thermometer is a commonly used tool in the laboratory. It is made based on the principle of ____________________ of liquids. Based on the operation of measuring the temperature of a liquid as shown in the figure, two precautions for using a thermometer are proposed:

Tips: Analyze the correct and incorrect use of thermometers from two aspects: First, the placement of the thermometer: the glass bulb should be completely immersed in the liquid being measured. The second is the reading of the thermometer: when reading, the glass bulb should continue to be placed in the liquid being measured, and the line of sight should be level with the liquid surface of the liquid column.

Analysis: The thermometer is filled with liquid, and the laboratory thermometer is made according to the thermal expansion and contraction properties of the liquid. Comparing the correct and incorrect placement of the thermometer during measurement, it can be seen that the thermometer should remain in the liquid being measured and cannot be taken out to read. Comparing the accuracy of the readings shows that when reading the readings, the line of sight should be level with the liquid surface of the thermometer liquid column and should not be tilted.

Answer: Thermal expansion and contraction ① When reading, the thermometer glass bulb should remain in the liquid being measured ② When reading, the line of sight should be level with the liquid level of the thermometer liquid column

2. The differences between three common thermometers in life

[Example 2] A thermometer and a laboratory thermometer are shown in the figure. Please briefly mention three differences in their construction or use:

(1)___.

(2)___.

(3)___.

Tips: This question is open to a certain extent. We can analyze it from different perspectives such as structure, range, graduation value, usage method, and internal liquid.

Analysis: This question examines the similarities and differences between thermometers and laboratory thermometers. Since the measurement objects of thermometers and laboratory thermometers are different, the structure of the thermometer is slightly more special than that of ordinary thermometers. That is, the tube hole at the connection between the glass bulb and the straight glass tube is particularly thin and slightly curved. When measuring body temperature, the mercury in the glass bubble expands as the temperature rises, and rises through the thin curved tube into the straight tube; when the thermometer leaves the human body, the mercury becomes cold and contracts, the mercury in the thin tube is disconnected, and the mercury in the straight tube cannot return to the glass. It is inside the bubble, so after leaving the human body, the thermometer can still accurately display the body temperature.

Answer: (1) The two thermometers have different ranges and graduation values

(2) There is a shrinkage (thin bend) on the thermometer’s vacuole, but the thermometer does not.

(3) Shake the thermometer before use, but do not use the thermometer

Temperature PPT, the third part: try the application

1. Temperature and thermometer

1.100 kg of ice at 0 ℃ compared with 50 kg of water at 0 ℃ ()

A.cold

B.Water cooling

C. Water and ice are equally hot and cold

D. None of the above judgments are correct

2. (2018·Gansu Silver High School Entrance Examination) Commonly used liquid thermometers are made based on the principle of liquid _________. When Xiaohua measured the outdoor temperature, he found that the temperature was rising. For the mercury in the thermometer, its temperature was ________ (choose "increase", "unchange" or "decrease").

2. Temperature in degrees Celsius

3. The correct reading of -20 ℃ is ()

A. Minus 20 degrees Celsius B. Minus 20 degrees Celsius

C. Minus 20 degrees Celsius D. Minus 20 degrees Celsius

4. The normal body temperature of a person is approximately ()

A.30 ℃ B.33 ℃

C.37 ℃ D.39 ℃

3. Use of thermometer

5. Regarding the thermometer as shown in the picture, which of the following statements is incorrect ()

A. Its indication is 10 ℃

B. Its minimum graduation value is 1 ℃

C. It cannot leave the measured object for readings

D. It is made according to the law of thermal expansion and contraction of liquids

Keywords: Free download of PPT courseware for eighth-grade physics volume 1 of the People's Education Press, download of temperature PPT, download of PPT on changes in states of matter, .PPT format;

For more information about the "Temperature Changes in State of Matter" PPT courseware, please click on the Temperature ppt Changes in State of Matter ppt tag.

"Temperature" Changes in State of Matter PPT download:

"Temperature" PPT download of changes in the state of matter Part One: New knowledge review 1. Temperature 1. Temperature is a physical quantity that represents the ________ of an object, and is commonly represented by the symbol ____. 2. The human body's perception of the hot or cold degree of an object is unreliable. In order to accurately judge the temperature of an object...

Color thermometer style PPT histogram:

These are two colorful thermometer-style PPT histograms with very personalized designs. .PPTX format;..

"Temperature and Air Temperature" Weather PPT:

"Temperature and Air Temperature" Weather PPT Part One Content: 1. Measurement and Comparison of Indoor and Outdoor Temperatures What can be used to measure temperature? Thermometer Do you remember what you know about thermometers? Tell which parts of the thermometer the arrows point to? The use of a thermometer requires...

File Info

Update Time: 2024-07-27

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

Preview