Pratique du Shadowing: The science of snowflakes - Maruša Bradač - Apprendre l'anglais à l'oral avec YouTube

C2
If you ever find yourself gazing at falling snow, why not catch a few snowflakes on your glove and examine their shapes?
⏸ En pause
30 phrases
Si les phrases sont trop courtes ou trop longues, cliquez sur Edit pour les ajuster.
1
If you ever find yourself gazing at falling snow, why not catch a few snowflakes on your glove and examine their shapes?
2
You might notice that they look symmetrical, and if you look closely, you'll see they have six sides.
3
You could say a snowflake is simply frozen water, but compare one with an ice cube from the freezer, and you'll realize they're very different things.
4
Unlike ice cubes, formed when liquid freezes into a solid, snowflakes form when water vapor turns straight into ice.
5
But that still doesn't explain why snowflakes have six sides.
6
To understand that, we need to delve deeper into the physics of water.
7
Water is made out of two hydrogen atoms and one oxygen atom.
8
A single water molecule thus has ten protons and ten electrons, eight from oxygen and one from each hydrogen atom.
9
The two electrons from oxygen's outer shell are shared with two electrons from both hydrogens as they bond together, and the remaining four outer shell electrons from oxygen form two pairs.
10
We call the bonds between these atoms covalent bonds.
11
The pairs of electrons are all negatively charged.
12
Similar charges repel, so they tend to stay as far away from each other as possible.
13
The pairs form four electron clouds, two of which are where the hydrogen and oxygen share electrons.
14
The repulsion between the unbonded pairs is even stronger than repulsion between the shared pairs, so the two hydrogens get pushed a little further to an angle of 104.5 degrees.
15
The water molecule as a whole is electrically neutral, but oxygen gets a larger share of electrons, making it slightly negative and the hydrogens slightly positive.
16
Due to its negative charge, the oxygen in one molecule is attracted to the positive charge of the hydrogen in another molecule.
17
And so a weak bond between the two molecules, called a hydrogen bond, is formed.
18
When water freezes, this bonding occurs on repeat, ultimately forming a hexagonal structure due to the angle between hydrogens and oxygen within each molecule.
19
This is the seed of a snowflake, and it retains a hexagonal shape as it grows.
20
As the snowflake moves through the air, water vapor molecules stick to the six sharp edges and expand the snowflake outwards, bit by bit.
21
A snowflake's developing shape depends on atmospheric conditions, like humidity and temperature.
22
As a snowflake falls, changes in weather conditions can affect how it grows, and even small differences in the paths two snowflakes take will differentiate their shapes.
23
However, since conditions at the six sharp edges of one snowflake are similar, a symmetric snowflake can grow.
24
Weather conditions affect snow on the ground, as well.
25
Warmer ground temperatures produce a wetter snow that is easier to pack because liquid water molecules help snowflakes stick to each other.
26
Melted snow also plays a critical role in another wintry activity, skiing.
27
Completely dry snow is very difficult to ski on because there's too much friction between the jagged snowflakes and the ski surface.
28
So what's happening is that as skis move, they rub the surface of the snow and warm it up, creating a thin layer of water, which helps them slide along.
29
So technically, it's not really snow skiing, but water skiing.
30
But it is true that no matter how hard you look, you're almost definitely not going to find two identical snowflakes, and that's a mystery that scientists are still trying to solve, though we know that it has to do with the many possible branching points in snowflake formation, and the differences in temperature and humidity, and while we wait for the answer, we can enjoy watching these tiny fractals falling from the sky.

Télécharger l'application

Notation IA pour chaque phrase que vous prononcez

Scanner pour télécharger
Scanner pour télécharger
Download on theApp Store
Get it onGoogle Play
TRENDING

Populaires

About This Lesson

In this lesson, you will explore the fascinating science behind snowflakes through a captivating video. As you prepare to learn English with YouTube, you will focus on understanding complex topics while improving your listening and speaking skills. By engaging with the content, you will practice the shadowing technique, allowing you to mimic the speaker’s intonation, rhythm, and pronunciation. This immersive approach will enhance your ability to understand detailed explanations and articulate complex ideas in English.

Key Vocabulary & Phrases

  • Symmetrical - Having balanced proportions; identical on both sides.
  • Hexagonal - A shape with six sides, relevant to the structure of snowflakes.
  • Covalent bonds - Chemical bonds formed by the sharing of electron pairs between atoms.
  • Hydrogen bond - A weak bond that occurs between a positively charged hydrogen atom and an electronegative atom.
  • Atmospheric conditions - The state of the atmosphere at a given location, influencing snowflake formation.
  • Humidity - The amount of water vapor present in the air, which affects how snowflakes grow.
  • Frictiion - The resistance encountered when one surface moves over another, relevant to skiing on snow.
  • Identical - Exactly alike; the same, often used in the context of finding similar snowflakes.

Practice Tips

To effectively implement the shadow speak technique while watching this video, start by playing it at a slower speed if necessary. As you listen, pause after each key point to repeat phrases and sentences aloud. Focus on mimicking the speaker's tone and pace, especially during discussions of complex scientific phenomena like snowflake formation. This practice will help you improve your pronunciation and fluency.

Try to embody the speaker's enthusiasm about the topic, which will not only make your practice enjoyable but also help you retain the vocabulary better. Additionally, consider jotting down notes of any phrases that resonate with you. Revisiting these notes while practicing your speaking will reinforce your learning. The combination of visual and auditory learning through shadowspeaks offers an effective approach to mastering English. Happy learning!

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.

☕ Offrez-nous un café