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Saint Francis DeSales

The Water Cycle: Evaporation, Condensation and Precipitation

This demonstration shows the water cycle. We have looked at how rain is made before, but this time we are going to look at how water can go from a salty source such as the ocean and by the process of evaporation, condensation and precipitation, ends up in a freshwater source, such as a river.
Put some water in a saucepan, along with about 3 tablespoons of salt and begin to heat on the stove, stirring to dissolve. You can let your students taste the water as long as they know that they can't taste anything unless you tell them it is okay. This represents the salty ocean water. We are adding heat to it just to speed up the evaporation process.
 While you are waiting for the water to come to a boil, take a zippered sandwich bog and fill it full of ice and then zipper shut. Place a bowl next to the saucepan and get a pot lid that is larger than the saucepan. Put the bag full of ice on top of the lid and hold the lid so that part of it is over the pot of boiling water and part is over the bowl, tilting toward the bowl, as shown above. (You might want to use a potholder, so you don't burn your hand.) When the steam, or water vapor, hit the pan lid, the coolness caused by the ice should turn the vapor back into liquid form, or condensation. This represents what happens when clouds form.
Eventually you will see water dripping off the pot lid and into the bowl.  This represents precipitation. Wait until there is enough water in the bowl to be able to taste it.
Your students should be surprised that the water now is not salty!
The salt is left behind, and if you let all the water boil away, you will see the salt left on the bottom of the pan, just as salt is left in the ocean when the water goes through the water cycle.

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source: Exploring Creation with Physical Science, Jay Wile

5 comments:

  1. We had so much fun with this experiment. I need to do it again to see if Selena remembers what she learned.

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  2. LOVE this...we are going to have to try it tomorrow!

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  3. Bother, I can't pin this because of problems with pinterest....... Very cool.

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  4. Hmmmm....... or maybe I accidentally deleted several. I swear I remembered commenting. I'm looking forward to meteorology for experiments like this. Or maybe I could do this and just pretend it rains here sometimes......

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  5. Hello,
    Challenge by a COLLEGIAN level of the "evaporation-condensation-rain" theory which he describes as absurd. If rainwater was formed as we have been told, it would have much more in summer than in winter since evaporation is more important in summer than in winter.
    In a page http://pdf.lu/zui0/

    "Lightning + thunder + rain = one operation"
    The synthesis of water is an explosive chemical reaction

    1-Photolysis (photodissociation or photo-decomposition) of ocean waters consists of the decomposition of the water molecule into molecules of hydrogen (H2) and into atoms (O) under the effect of solar radiation, The ultraviolet. In view of the abundance of H2 molecules and free O atoms, a small number of them collide and form water molecules, called water vapor In the gaseous state even if it is always a compound compound H2O)
    https://en.wikipedia.org/wiki/Photolysis www.google.dz/search?q=photolysis

    2-This water vapor H2O is in turn decomposed into H2 and O since it is even closer to UV rays with short wavelengths (very energetic). The lighter molecules H2 will rise the most (this is called positive cloud wrongly because it is not a cloud, the cloud is formed of bipolar water molecules in themselves + and -) And the heavier O atoms will be below the hydrogen layer (this is what is wrongly called a negative cloud, the cloud is formed of bipolar water molecules in and of themselves) This is the true sublimation, the two simple gaseous bodies are free (final state).

    3-The rising currents of hot air represent a mechanical force opposed to that of the descending air currents, there is the opposition of two mechanical forces from which compression and under the effect of agitation and Friction as well as solar radiation, hydrogen ionizes positively and oxygen negatively and at the favorable rate of compression, the two gases combine in an explosive chemical reaction (the synthesis of water is explosive), they form the water.
    Which says explosion said electric spark, detonation therefore (lightning + thunder + water = one and only operation).
    The light of light comes first (speed of light 299.792.458 m / s), the sound of the explosion which is thunder (speed of sound 340 m / s) second
    It occurs around the earth between 2000 to 5000 storms per second (that is to say between 172.800.000 times to 432.000.000 times in 24 H)
    http://www.planetoscope.com/atmosphere/252-nombre-d-orages-dans-le-monde.html
    And each storm cell can produce more than 100 flashes per minute (ie between 17,200,800,000 and 43,200,000,000 flashes) and as each flash is the index of a chemical synthesis reaction of water (H2 + O -> H2O), you can imagine the volume of water that can form in our atmosphere every second.
    http://www.astrosurf.com/luxorion/meteo-orages3-eclairs.htm
    4-Condensation: Once the water formed as I have detailed, it suffices that a certain number of molecules of water can be united by coalescence and acquire a weight that can be influenced by the earth's attraction to fall into the form of Water droplets (rain).
    The density of air (29/29 = 1), (H2 = 2/29 = 0.06), (O = 16/299 = 0.55), they are very light, they escape at high speed. And then 78% diazote, 21% dioxide and 1% (hydrogen, rare gases, aerosols and moisture).
    The theory of "evaporation-condensation-rain" is a stupidity We were indoctrinated by this 17 th century theory,

    I left the studies for it

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