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  • Smart Learning for All.

  • Crystallisation.

  • Food tastes good due to the addition of salt in it.

  • Hey friend.

  • Hello.

  • I have prepared some delicious soup.

  • Do you know how salt is obtained?

  • No idea.

  • I will tell you how.

  • Salt is obtained by the evaporation of seawater.

  • However, this salt is impure and has small crystals.

  • This salt can be converted into pure state by the process of crystallization.

  • Crystallization is the process of formation of large crystals in pure state from their solutions.

  • Let us do an activity to understand crystallization.

  • Activity time.

  • Come with me.

  • You will assist me in this activity.

  • I am not interested.

  • If you assist me, then i will give you a reward.

  • Now, get me some water.

  • Take some water in a container and heat it.

  • The water has started boiling.

  • Now, get me some salt.

  • Got it.

  • Once water starts boiling, slowly start adding some plain salt to it.

  • Careful, this mixture is hot.

  • Stir mixture constantly and keep on adding plain salt to it until no more of the salt can dissolve in water.

  • Seems like enough salt has been added.

  • Now, we will filter the solution.

  • Filter the solution.

  • Interesting.

  • Now, we will allow the solution to cool.

  • After a while.

  • I think the solution has cooled by now.

  • Now, pass me the string.

  • Take a stick and tie the string to it.

  • Now, place the string inside the solution.

  • In the meantime, we will go on a vacation for a few days.

  • Wow.

  • See you after some days.

  • After few days.

  • After pulling the string out, we will see large salt crystals attached together on it.

  • This is the process of crystallization.

  • Very interesting.

  • Take your reward.

  • Thanks.

  • Safety Rules.

  • This experiment should only be done under adult supervision.

  • The boiling water can get extremely hot, so care should be taken while performing this experiment.

  • The End.

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Smart Learning for All.


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B1 中級 美國腔

結晶|#aumsum (Crystallization | #aumsum)

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    AumSum 發佈於 2021 年 01 月 14 日