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"The Secret of the Thermometer" PPT courseware
Part One: Structure of Thermometer
unit scale
Glass tube, liquid column, glass bubble, also called vacuole
industrial thermometer
It is widely used in petroleum, chemical industry, metallurgy, textile, food and other industrial production. The temperature measurement range is: -80~650℃
thermometer
A thermometer is a household thermometer that is often used to measure indoor temperatures. The scales on the meter are usually divided into Fahrenheit and Celsius.
Part 2: Measure the temperature of two glasses of water with a water thermometer
1. Issues that should be paid attention to during the experiment
2. What did you find?
3. Ask your questions and conjectures
Kind tips
1. The group should divide work and cooperate.
2. Assemble the analog thermometer and seal the Erlenmeyer flask tightly with the rubber stopper.
3. Carefully observe the changes in the water column and make marks with colored pens of different colors.
4. The recorder records the observed phenomena on the record sheet in a timely manner.
5. Pay attention to safety: glass equipment should be handled with care, and do not burn yourself with hot water.
Part 3: Abnormal expansion of water
There are a few substances in nature that under certain conditions do not expand with heat but expand with heat and cold. This phenomenon is called "abnormal expansion."
Water not only has the property of thermal expansion and contraction above 4℃, but also has the property of heat shrinkage and cold expansion below 4℃.
Water has the smallest volume at 4°C. As the temperature decreases below 4°C, its volume continues to increase, thus bursting the water pipe or water tank.
solve problems in life
1. Why are the liquids in these bottles not filled?
2. Can the thermometer measure water temperature?
In order to prevent the beverage from exploding due to the high temperature in summer.
Part 4: After-class exercises
Test you
1. Under normal circumstances, the volume of a liquid will ________ when heated and ______ when cooled. This property of liquid is called ______.
2. The thermometer works by utilizing the principle of liquid ______.
3. The dividing point between thermal expansion and contraction of water and thermal contraction and expansion is __℃. Below the dividing point, the volume gradually ____ as the temperature decreases. Above the dividing point, the volume gradually ___ as the temperature increases. The volume of water is smallest at ___℃.
True or False
1. All objects in nature have the property of thermal expansion and contraction ( )
2. Liquids have the property of thermal expansion and contraction under any conditions ( )
3. The liquids in the thermometer are usually alcohol, mercury and kerosene ( )
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"The Secret of the Thermometer" PPT:
"The Secret of the Thermometer" PPT Part One: Measuring Temperature with a Thermometer Why can a thermometer measure temperature? Observe the structure of the thermometer 1. Tell me what the thermometer you observe looks like. Point with one finger: glass tube, glass bubble, liquid, liquid column 2. ..