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Authoritative PPT Summary
"Temperature" Changes in State of Matter PPT Courseware 8
learning target
Understand the concept of temperature
Understand how liquid thermometers work and how to regulate temperatures in degrees Celsius
Understand common temperature values in living environments
Able to measure temperature with a common thermometer
Temperature: How hot or cold an object is.
To accurately judge and measure temperature, a thermometer is necessary.
homemade thermometer
Principle: It is made based on the thermal expansion and contraction properties of liquids.
1. Temperature
1. Definition: The degree of hotness or coldness of an object is called temperature.
2. Commonly used temperatures in daily life
Unit: Celsius (℃)
3. The normal human body temperature is 37 ℃
4. Some temperature values in nature
1. Thermometer
Principle: It is made according to the law of thermal expansion and contraction of liquid.
Liquid: kerosene, mercury, alcohol.
2. Celsius temperature
It is divided into 100 equal parts between 0℃ and 100℃. Each equal part is called 1℃ and is recorded as 1℃.
Under standard atmospheric pressure, the temperature of ice-water mixture is specified as 0°C, and the temperature of boiling water is specified as 100°C.
It is divided into 100 equal parts between 0℃ and 100℃. Each equal part is called 1℃ and is recorded as 1℃.
3. Use of thermometer
Range: The maximum and minimum temperature range that the thermometer can measure.
Graduation value: the temperature value represented by each small grid
Want to discuss
Liquid in the thermometer may burst the thermometer
What will happen if the measured temperature is too high and exceeds the maximum temperature that the thermometer can measure?
What will happen if the measured temperature is too low, lower than the lowest temperature that the thermometer can measure?
How to use a thermometer
Instructions:
1. How to put it: The glass bulb of the thermometer should be completely immersed in the liquid being measured, and should not touch the wall or bottom of the container.
2. When to read: Wait for a while after the glass bulb is immersed in the liquid to be measured, and then read after the reading is stable.
3. How to read: When reading, the glass bubble should remain in the liquid being measured, and the line of sight should be level with the surface of the liquid column.
thermometer reading
After taking the temperature reading, shake the thermometer.
If it is not turned off, the number will only rise but not fall.
For example, a patient's temperature was 380C and he did not shake it off after measuring.
If the body temperature is measured at 370C again, the reading will be 380C.
If the body temperature of 390C is measured again, the reading will be 390C.
Apply what you learn:
1. Temperature is a physical quantity that expresses the _________degree of an object.
2. Commonly used thermometers are made by utilizing the properties of ________.
3. The Celsius temperature is 0oC. At one standard atmospheric pressure, the temperature of boiling water is ________.
4. Each thermometer has a certain range and ________.
5. As shown in the picture on the right, the measuring range is ________, the graduation value is ________, and the temperature currently represented is ________.
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