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CHALLENGE 2Loading...
What are the conditions for water passing from one state to another?Loading...
Enjoy maths and sciences!Loading...
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Does heat accelerate the vaporization of water ?
Vaporization
by the Icelandic school for the French school
Objectives of the experiment:
-To realize the different forms of water and to observe with its own eyes its phase change from liquid form to gaseous form.
Material:
-Saucepan, thermometer, water, timer, camera, stove, 1 liter of water and registration forms.
1. The experiment is carried out in the school's teaching kitchen.
2. Each group measures 1 liter of water and puts in a saucepan.
3. Water temperature initially measured and recorded.
4. Timing begins as soon as the stove is turned on.
5. Time recorded at every 10 degrees of temperature rise, from 20°C to 100°C.
6. Time recorded when the first steam is observed.
7. Time recorded when all the water has evaporated and then the experiment is complete.
8. It‘s important to take pictures of the whole process.
2. Each group measures 1 liter of water and puts in a saucepan.
3. Water temperature initially measured and recorded.
4. Timing begins as soon as the stove is turned on.
5. Time recorded at every 10 degrees of temperature rise, from 20°C to 100°C.
6. Time recorded when the first steam is observed.
7. Time recorded when all the water has evaporated and then the experiment is complete.
8. It‘s important to take pictures of the whole process.
Organization of the classroom:
-Students are divided into groups of 3 people. Each student has a role, one measures temperature, another mesures time and a third records on paper.
Additional explanations (prerequisite knowledge, preliminary observation):
-Students are familiar with steam in different conditions, such as evaporation in frost from a hot pool, steam pads from hot springs.
Conduct of the experiment:
1. The experiment is carried out in the school's teaching kitchen.
2. Each group measures 1 liter of water and puts in a saucepan.
3. Water temperature initially measured and recorded.
4. Timing begins as soon as the stove is turned on.
5. Time recorded at every 10 degrees of temperature rise, from 20°C to 100°C.
6. Time recorded when the first steam is observed.
7. Time recorded when all the water has evaporated and then the experiment is complete.
8. It‘s important to take pictures of the whole process.
2. Each group measures 1 liter of water and puts in a saucepan.
3. Water temperature initially measured and recorded.
4. Timing begins as soon as the stove is turned on.
5. Time recorded at every 10 degrees of temperature rise, from 20°C to 100°C.
6. Time recorded when the first steam is observed.
7. Time recorded when all the water has evaporated and then the experiment is complete.
8. It‘s important to take pictures of the whole process.
How to ...
Vaporization
by the French school from an Icelandic experimental protocol
Forecasts after reading the question:
Yes because...
- when a stove is hot and you put cold water it evaporates immediately
- when I go to the sea in summer I feel the humidity in the air
- when a stove is hot and you put cold water it evaporates immediately
- when I go to the sea in summer I feel the humidity in the air
Pooling of results:
Experiment 1 : Heated water
The experiment (videos or photos of students):
- completely evaporated in 14 minutes
- at 50°C we can see water vapor
- at 100 °C the temperature has stabilized
- at the beginning a temperature of 20 °C
- at 50°C we can see water vapor
- at 100 °C the temperature has stabilized
- at the beginning a temperature of 20 °C
Experiment 2 : Not heat water
The same quantity of water has not yet evaporated after 10 days.
Conclusion:
Heated water evaporates much faster than water at ambient temperature.
Experiment 1 :Heated water
So heat accelerates the evaporation of water.
Experiment 2 : not heated water
Pooling of results:
Experiment 1 : Heated water
- completely evaporated in 14 minutes
- at 50°C we can see water vapor
- at 100 °C the temperature has stabilized
- at the beginning a temperature of 20 °C
- at 50°C we can see water vapor
- at 100 °C the temperature has stabilized
- at the beginning a temperature of 20 °C
Experiment 2 : Not heat water
The same quantity of water has not yet evaporated after 10 days.
Conclusion:
Heated water evaporates much faster than water at ambient temperature.
So heat accelerates the evaporation of water.
How to create a portable cloud?
Vaporization
Conduct of the experiment:
by the Italian school for the Estonian school
Objectives of the experiment:
- observe how a cloud is formed thanks to moisture (humidity), cooling temperature and condensation nuclei.
Materials:
- A gallon jar, food colouring, a rubber glove, matches, a lamp, hot and cold water, a rubber bend.
Organization of the classroom:
- Group work (pay attention to anti-Covid19 rules)
- Flipped classroom
- Flipped classroom
Additional explanations (prerequisite knowledge, preliminary observation):
1. Pour 100 ml of cold water into the jar. Add food colouring to the water.
2. Swirl the water in the jar for one minute to allow some water to evaporate.
3. Stretch the open end of a rubber glove over the mouth of the jar, with the glove fingers hanging down into the jar.
4. Place a rubber band around the mouth of the jar to secure the glove.
5. Turn on the lamp so it shines through the jar.
6. Insert your hand into the glove. Pull quickly outward without disturbing the jar's seal. Record your observations.
7. Quickly push your hand back down into the jar. Record your observations.
8. Carefully remove the glove from the jar.
9. Drop a lit match into the jar and quickly seal it again with the rubber glove as before.
10. Insert your hand into the glove. Pull quickly outward without disturbing the jar's seal. Record your observations.
11. Repeat the entire procedure using hot tap water instead of cold water.
2. Swirl the water in the jar for one minute to allow some water to evaporate.
3. Stretch the open end of a rubber glove over the mouth of the jar, with the glove fingers hanging down into the jar.
4. Place a rubber band around the mouth of the jar to secure the glove.
5. Turn on the lamp so it shines through the jar.
6. Insert your hand into the glove. Pull quickly outward without disturbing the jar's seal. Record your observations.
7. Quickly push your hand back down into the jar. Record your observations.
8. Carefully remove the glove from the jar.
9. Drop a lit match into the jar and quickly seal it again with the rubber glove as before.
10. Insert your hand into the glove. Pull quickly outward without disturbing the jar's seal. Record your observations.
11. Repeat the entire procedure using hot tap water instead of cold water.
- knowing that water is in three states: liquid, solid and gas