Pratique du Shadowing: Separating Solutions – Distillation - Apprendre l'anglais à l'oral avec la vidéo
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This video is sponsored in part by Blue Ring Education, the makers of Next Generation Science, Metholia and Kids Health Net.
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One way we can separate a solution is through a process called distillation.
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Let's take a look at this process in action.
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Step 1.
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Set up the distillation apparatus.
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The typical distillation apparatus consists of a burner, a distillation flask containing the substance we want to distill,
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a thermometer, a condenser, a receiving flask, and some corks to connect the components.
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Step 2.
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Cool the condenser.
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Cool water is fed into and out of the condenser to keep it at a low temperature.
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This is essential for condensing the vapour back into a liquid.
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Step 3.
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Heat the substance.
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The burner is used to heat the substance we wish to distill in the distillation flask.
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As the temperature rises, keep an eye on the thermometer to monitor the boiling point of the substance.
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Step 4.
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Vaporisation As the substance is heated, it begins to evaporate and boil,
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causing vapour to rise from the liquid in the distillation flask.
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Step 5.
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Vapour enters the condenser The vapour passes through the neck of the distillation flask and enters the condenser.
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The condenser is kept cool by the circulating water, which causes the vapour to cool and condense back into a liquid.
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Step 6.
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Collection of the distillate The condensed liquid,
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known as the distillate, drips from the condenser into the receiving flask.
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This distillate is the purified substance that we aimed to separate from the mixture in the distillation flask.
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Step 7.
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Completion of distillation
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the distillation process continues until all of the desired substance has been vaporized
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and condensed into the receiving flask the substance remaining in the distillation flask
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which has a higher boiling point is called the residue
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or the still bottom by carefully controlling the temperature
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and collecting the distillate at the appropriate boiling point we can separate
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and purify the desired substance from a mixture using the distillation apparatus.
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This method is widely used for various purposes, such as purifying water, perfumery and the production of essential oils.
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Vocabulaire et conseils d’expression pour cette leçon
Cette vidéo contient 34 phrases et 345 mots à répéter en shadowing. La partie parlée dure 3:13. Le locuteur parle lentement, environ 107 mots par minute, ce qui laisse le temps d’imiter chaque son. Seuls 67 % des mots font partie des 3 000 mots les plus courants en anglais, le vocabulaire est donc exigeant.
Vocabulaire clé de cette vidéo
15 mots de la vidéo à retenir, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| substance nom | /ˈsʌbstəns/ | substance |
| liquid nom | /ˈlɪk.wɪd/ | liquide |
| boil verbe | /bɔɪ(ə)l/ | faire bouillir, porter à ébullition |
| apparatus nom | /ˌæp.əˈɹeɪ.təs/ | appareil |
| mixture nom | /ˈmɪkst͡ʃɚ/ | mélange |
| burner nom | /ˈbɝnɚ/ | feu, brûleur |
| carefully adverbe | /ˈkɛɹf(ə)li/ | soigneusement |
| connect verbe | /kəˈnɛkt/ | accoupler, connecter |
| collect verbe | /ˈkɑlɪkt/ | rassembler, recueillir |
| monitor nom | /ˈmɑ.nɪ.tɚ/ | moniteur, monitrice |
| component nom | /kəmˈpoʊ.nənt/ | composant |
| maker nom | /ˈmeɪk.ɚ/ | faiseur, fabricant |
| completion nom | /kəmˈpliː.ʃən/ | achèvement |
| sponsor nom | /ˈspɒn.səː/ | commanditaire, sponsor |
| consist nom | /kənˈsɪst/ | rame |
Les verbes à particule que vous entendrez
| Mot | Prononciation | Sens |
|---|---|---|
| pass through verbe | traverser | |
| set up verbe | /ˌsɛt ˈʌp/ | mettre en place, installer |
Prononciation à surveiller
- Les sons « sh » et « zh »: completion /kəmˈpliː.ʃən/, distillation /dɪstɪˈleɪʃən/
- Mots longs — placez bien l’accent: apparatus /ˌæp.əˈɹeɪ.təs/, distillation /dɪstɪˈleɪʃən/, thermometer /θɚˈmɑ.mɪ.tɚ/, evaporate /ɪˈvæp.ə.ɹeɪt/, perfumery /pəˈfjuːm(ə)ri/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Répétez phrase par phrase à vitesse normale, en reprenant chacune jusqu’à ce que votre rythme corresponde à celui du locuteur.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme substance, liquid, boil.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.