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"Ice Melts" Changes in Temperature and Water PPT Courseware 3
recall
Last class we turned the water in the test tube into ice. What did you find?
Do you know what the process of turning water into ice is called?
Scientists say: For an object, when the temperature drops, it means that its heat is decreasing.
We found that when water turns to ice, the temperature gradually decreases. How does this explain the change of heat?
Experimental steps
How does the temperature change as ice melts?
(1) Let the ice melt without any disturbance.
(2) Insert the thermometer into the crushed ice. Use a thermometer to measure and record the temperature of the ice cubes.
(3) Record the temperature of the ice cube every one minute.
(4) If you observe that the ice cube has completely melted, record the thermometer reading.
Report and exchange:
What is the temperature of water when it melts?
Answer: The temperature of ice when it turns into water is around 0℃.
What do you think will happen to the temperature of the water next?
Answer: The temperature of the water will continue to rise until it is the same temperature as the air in the classroom.
What I found:
When the ambient temperature exceeds 0°C, ice begins to melt; during the melting process of ice, the temperature always remains at 0°C, but the temperature of the air next to the ice cubes drops (because the ice cubes continue to absorb heat from the surrounding air when melting) ; After the ice cubes completely melt into water, the temperature will continue to rise.
There are water droplets on the outside of the cup.
Is there any way to make the ice melt faster?
Place it in a place with high temperature, bask in the sun, cover it with your hands, blow hot air from your mouth...
ice melting contest
Method: Each group puts a piece of ice into a plastic bag, and the mouth of the bag should be sealed. Compare which group of ice melts faster. Also observe what you discovered during the experiment?
The ice has melted and there are drops of water on the outside of the plastic bag.
Celsius temperature regulations
The temperature of the ice-water mixture under 1 standard atmosphere is defined as 0 degrees Celsius, and the temperature of boiling water is defined as 100 degrees Celsius. Divide into 100 equal parts between 0 degrees Celsius and 100 degrees Celsius, each divided into 1 degrees Celsius, recorded as 1 ℃
Celsius temperature unit: degrees Celsius (℃)
Use of thermometer
Use a thermometer correctly:
1. See clearly the range and graduation value of the thermometer;
2. The glass bulb of the thermometer should be completely immersed in the liquid to be measured, and do not touch the bottom or wall of the container; (immerse in the liquid, do not touch the bottom of the wall)
3. Wait for a while after the glass bulb of the thermometer is immersed in the liquid to be measured, and then take a reading after the thermometer's reading is stable;
4. When reading, the glass bulb of the thermometer should remain in the liquid, and the line of sight should be level with the upper surface of the liquid column in the thermometer. (Read steadily and look straight into the liquid)
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