"Temperature and Thermometer" Temperature and changes in physical state PPT courseware

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"Temperature and Thermometer" Temperature and changes in physical state PPT courseware

1. Talking about the water journey

Clouds come in different shapes. Do you know where the cloud comes from?

Rain, where does it come from? Where is it drifting to?

Legend has it that the flying snowflakes come from the feather pillow of "Mother-in-law" in the sky. Do you believe it?

1. Clouds, rain, snow... they are all water, just in different shapes.

2. Water changes in many ways. It can not only turn into clouds, rain, and snow, but also turn into dew, fog, frost, etc.

water journey

1. Can humans make rain?

Put ice into a test tube, then heat it and observe the changes in the ice. Continue to heat, and after the water boils, place a glass piece close to the mouth of the test tube.

Through observation, you can know: During the heating process, --ice-- turns into --- water-, --- water- turns into --- water vapor-, and --- water vapor- returns to --- water on the glass piece. --. If you put water in the refrigerator, it can turn back into ice.

2. How are clouds, rain, and snow formed?

Sunlight increases the temperature of water on the ground, causing hot air containing water vapor to rise. As it rises, the air gradually cools and the water vapor condenses into small water droplets or small ice crystals, forming clouds.

Rain occurs when small water droplets in clouds merge into larger droplets.

If the temperature above is lower, water can also fall to the ground in the form of snow.

2. Temperature

1. What is temperature?

The degree of hotness or coldness of an object is called temperature.

2. Commonly used temperature units in daily life: degrees Celsius (℃)

3. The normal human body temperature is 37 ℃

4. Some temperature values ​​in nature

Gas Station: Thermodynamic Temperature Scale

The temperature scale used in the International System of Units is the thermodynamic temperature scale. The unit name of this temperature scale is "Kelvin", or "Kelvin" for short. The symbol is K. The relationship between thermodynamic temperature (T) and Celsius temperature (t) is:

T=t+273

The lower limit of temperature in the universe is -273°C. Research shows that no matter how humans improve low-temperature technology, the temperature of 0K cannot be reached. That is -273 ℃ which cannot reach Celsius temperature.

The thermodynamic temperature scale is used in the study of microscopic particles and celestial bodies.

The principles of commonly used thermometers:

It is made based on the principle of thermal expansion and contraction of liquids such as mercury, kerosene, or alcohol.

Why are some of the liquids in thermometers kerosene and some mercury?

Other thermometers:

1. Digital thermometer: It is made based on the relationship between the conductivity of materials and temperature.

2. Thermometer made of bimetallic sheet.

3. Color thermometer: It measures temperature based on the color of the light emitted by high-temperature objects. One color on the color thermometer represents a certain temperature. By comparing the color of a red-hot object with the color of the color thermometer, you can estimate the temperature of the object.

Summary: Using a Thermometer

Observe ______ and ______ before use.

The thermometer glass bulb should be ______ in the liquid being measured and should not touch ______ or ______.

Wait until the display shows ______ before reading.

Do not take the thermometer out of the liquid being measured to read. When looking at the thermometer, the line of sight must be ______ with the liquid level inside the thermometer.

thermometer

1. Thermometer - a medical thermometer used to measure body temperature

2. The liquid in the thermometer is _________.

3. The measuring range is ________. The graduation value is _________.

Class exercises

1. Temperature is a physical quantity that represents ________. Commonly used thermometers measure temperature based on the properties of ________. The letter C on the thermometer indicates that the ______ temperature is used, which specifies the temperature of _______ at 1 standard atmosphere. is 0℃, the temperature of ______ at 1 standard atmosphere is defined as 100℃.

2. The normal human body temperature (oral temperature) is approximately ______, pronounced ______.

3. The measuring range of the thermometer is ________, and the graduation value is ______.

4. The correct pronunciation of -20℃ is [ ]

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

C. Negative 20 degrees Celsius D. minus 20 degrees Celsius

5. In 4-1, the readings of each thermometer are:

A is_____________

B is_____________

C is ____________

6. The correct way to disinfect a thermometer is [ ]

A. Boil in boiling water. B． Use alcohol lamp to heat.

C. Rinse with tap water. D． Wipe with alcohol cotton.

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

"Temperature and Thermometer" Temperature and changes in physical state PPT courseware 3:

"Temperature and Thermometer" Temperature and Physical State Changes PPT Courseware 3 1. Wonderful water Water has various forms and can not only become ______, _____, _____ but also _____, _____, _____, etc. . 2. Water Journey 1. The three states of water...

"Temperature and Thermometer" Temperature and changes in physical state PPT courseware 2:

"Temperature and Thermometer" Temperature and Physical State Changes PPT Courseware 2 1. Water Journey 1. How does water change? Put ice into a kettle, then heat it and observe the changes in the ice. Keep heating until the water boils, hold a spoon close to the spout. Through observation, it can be seen that during heating...

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Update Time: 2024-11-22

This template belongs to Physics courseware Shanghai Science Edition Ninth Grade Physics industry PPT template

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