Shadowing Practice: Glow in the Dark Lava Lamp! - Learn English Speaking with Video

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Have you ever wondered why do highlighters seem to glow so brightly?
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We are going to learn about all of this and more today with my glowing lava lamp experiment.
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Hi everyone, I'm Emily Calandrelli,
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MIT engineer and host of Emily's Wonder Lab on Netflix and on my channel we learn about all things science and space.
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So grab those highlighters and those black lights
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because this kitchen is about to glow for this one
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you're going to need a glass of water filled about
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three -fourths the way up a yellow highlighter pliers oil to
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fill your glass the rest of the way up a black light
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and a fourth cup of salt adults
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and parents you'll want to do this one take your pliers
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and grab the inside of the end of your highlighter and just bend it in, bend it towards the center and pop, it comes right off.
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Now, I'm gonna wear gloves for this one.
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You don't need to because it is just highlighter ink after all, but I don't want my fingers to get stained, so I'm going to.
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So go ahead and take the tube that's inside the highlighter out.
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This contains your highlighter ink.
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Now, what you wanna do is squeeze it inside your glass of water.
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Three, two, one.
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Doesn't that look so cool?
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Now you'll notice that the highlighter seems to glow even though we don't have our black light on.
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Why is that?
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Well, it's because highlighter contains phosphors and phosphors make this fluorescent.
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That means it has the ability to absorb ultraviolet light and reinvent some of that light as visible light,
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light we see with our eyes basically it means it glows
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but where is the ultraviolet light right that usually comes from our black light
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but we don't have that on there is always ambient ultraviolet light in any room
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that you're in and
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that is what is making our highlighter glow next you want to take your oil
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and fill your glass the rest of the way up
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so you'll notice that the oil is rising to the top this is because oil is less dense than water.
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So it's going to float right on top of the water.
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And now we can make this glow.
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Three, two, one.
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Oh, look at that.
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So you can see everywhere that the highlighter is, is glowing.
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It is actually fluorescing.
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And now we can transform this into a lava lamp with our salt.
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So what you want to do is just take a handful of salt.
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I'm going to go ahead and turn my light on so it's glowing as we do this.
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And you may need this much, you may not.
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It depends on how many times you want to do your lava lamp.
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But just go ahead and take a handful of salt and sprinkle it all across the top.
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The salt is denser than the oil and the water
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and as it falls down through the oil it grabs on to some of
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that oil bringing the oil down to the bottom
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but then the salt dissolves and that oil is released back up to the top
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because remember oil is less dense than water
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so it rises back up to the top creating
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that lava lamp effect another way to create your lava lamp effect is with alka -seltzer tablets just go ahead
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and throw these in just like this and those bubbles are bubbling to the top.
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Now if you want to experiment within the experiments you can try different oils, you can try sugar instead of salt,
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and you can try different highlighter colors just to see what happens.
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If you try any of these let me know what you find.
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Thanks for making glow -in -the -dark lava lamps with me.
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If you like this one check out my best -selling
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Stay Curious and Keep Exploring series for 99 more science experiments that are fun for the whole family.
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I'm Emily Calandrelli.
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Subscribe to learn about all things science and space.
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And remember to stay curious and keep exploring.
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I'll see you next time.

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Vocabulario y notas de pronunciación para esta lección

Esta lección de conversación se basa en el vídeo “Glow in the Dark Lava Lamp!”. Las palabras que más se repiten: highlighter, oil, glow, salt, lava. Este vídeo tiene 60 frases y 693 palabras para practicar shadowing. La parte hablada dura 4:11. El hablante habla a un ritmo natural de unas 166 palabras por minuto, cercano a una conversación cotidiana. El 84 % de las palabras está entre las 3.000 más comunes del inglés; conviene repasar el resto antes de empezar.

Vocabulario clave de este vídeo

15 palabras del vídeo que vale la pena aprender, con su pronunciación y significado:

PalabraPronunciaciónSignificado
glow verbo/ɡloʊ/fulgir, fulgurar
lamp sustantivo/ˈlæ̝mp/lámpara
lava sustantivo/ˈlɑvə/lava
experiment sustantivo/ɪkˈspɛɹ.ə.mənt/experimento
dense adjetivo/ˈdɛns/denso
curious adjetivo/ˈkjʊɹ.i.əs/curioso, tener curiosidad
explore verbo/ɪkˈsploɹ/explorar
bubble sustantivo/ˈbʌbəl/burbuja, pompa
bend verbo/bɛnd/cimbrar, cimbrear
handful sustantivo/ˈhæn(d)fʊl/puñado
finger sustantivo/ˈfɪŋɡɚ/dedo, alambres
visible adjetivo/ˈvɪzɪb(ə)l/visible
tube sustantivo/tuːb/tubo, chisguete
depend verbo/dɪˈpɛnd/depender/pender (de), ser dependiente (de)
tablet sustantivo/ˈtæblət/placa

Phrasal verbs que vas a escuchar

PalabraPronunciaciónSignificado
go ahead verbo/ˌɡoʊ əˈhɛd/venga, adelante
check out verboinvestigar, chequear

Frases que vale la pena repetir

Frases cortas y completas del vídeo que puedes reutilizar en la conversación diaria:

  • Have you ever wondered why do highlighters seem to glow so brightly?
  • Doesn't that look so cool?
  • I'll see you next time.

Gramática en este vídeo

Las estructuras que más usa el hablante, con las palabras exactas del vídeo:

EstructuraEn el vídeo
Comparativos -er than / more … than — comparar dos cosasless dense than · denser than
Verbo + -ing enjoy, keep, stop… + -ing — verbos seguidos de la forma en -ingKeep Exploring
Present continuous am/is/are + -ing — algo que ocurre ahora o en estos díasis making · is rising · is glowing
Futuro con “going to” be going to + verbo — un plan o algo que se ve venirare going to learn · you're going to need · gonna wear

Pronunciación a tener en cuenta

El hablante usa 18 contracciones y formas reducidas, como I'm, don't, you'll. Dilas en su forma corta, tal como las oyes.

  • Palabras largas — cuida el acento: experiment /ɪkˈspɛɹ.ə.mənt/, ultraviolet /ˌʌltɹəˈvaɪələt/

Sonidos difíciles para hispanohablantes:

  • s + consonante al inicio — sin añadir una “e” delante: squeeze /skwiːz/, stain /steɪn/, sprinkle /ˈspɹɪŋkəl/
  • /v/ — no es /b/: los dientes tocan el labio inferior: lava /ˈlɑvə/, visible /ˈvɪzɪb(ə)l/, glove /ɡlʌv/, ultraviolet /ˌʌltɹəˈvaɪələt/, dissolve /dɪˈzɑlv/
  • /z/ — sonora, no /s/: visible /ˈvɪzɪb(ə)l/, squeeze /skwiːz/, pliers /ˈplaɪ.ə(ɹ)z/, dissolve /dɪˈzɑlv/

Cómo practicar con este vídeo

  1. Escucha el vídeo entero una vez sin hablar y anota las palabras que no conoces.
  2. Empieza a velocidad 0,75×, haz shadowing frase por frase y vuelve a la velocidad normal cuando te resulte fácil.
  3. Grábate y compara con el original, prestando atención a palabras como glow, lamp, lava.

¿Qué es la Técnica de Shadowing?

Shadowing es una técnica de aprendizaje de idiomas respaldada por la ciencia, desarrollada originalmente para la formación de intérpretes profesionales y popularizada por el políglota Dr. Alexander Arguelles. El método es simple pero poderoso: escuchas audio en inglés nativo y lo repites en voz alta de inmediato, como una sombra que sigue al hablante con solo 1-2 segundos de retraso. A diferencia de la escucha pasiva o los ejercicios de gramática, el shadowing obliga a tu cerebro y músculos de la boca a procesar y reproducir simultáneamente patrones de habla reales. Las investigaciones muestran que mejora significativamente la precisión de la pronunciación, la entonación, el ritmo, el habla conectada, la comprensión auditiva y la fluidez al hablar, convirtiéndola en una de las metodologías más efectivas para la preparación del IELTS Speaking y la comunicación en inglés en el mundo real.

Técnica de shadowing: lee la guía completa paso a paso →