跟讀練習: States of Matter | Solid Liquid Gas - 通過影片學習英語口語
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This is water.
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This is water.
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Whoops.
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This is water.
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But why does it look and behave so differently?
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We're going to find out together as we explore the different states of matter.
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Everything is made of matter.
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Things like this.
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Matter makes up all the stuff in the universe.
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Anything that takes up space and has mass is matter.
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All matter is made of atoms, which are in turn made of protons, neutrons, and electrons.
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Atoms hang out together to form molecules, which are the building blocks for all types of matter.
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Both atoms and molecules are held together by a form of potential energy called chemical energy.
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Matter exists in different states.
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Today, we are going to investigate the three most common states.
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Solid state, liquid state, and gaseous or gas state.
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In a solid, particles are packed tightly together, so they don't move much.
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The forces between particles are so strong that the particles cannot move freely, but can only vibrate.
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Because of this, particles in a solid have very low kinetic energy.
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Kinetic energy is the energy that an object has because of its motion.
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Solids have a definite shape, as well as definite volume and mass, and don't conform to the shape of a container that they're placed inside.
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Conform just means to change in order to fit.
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Solids are true to themselves.
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They don't change for anyone, unless they get really uncomfortable under pressure or things begin to heat up.
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Solids also have high density, which means that their particles are packed tightly together.
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Solids can only change their shape by an outside force, like this.
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In a liquid, the particles are more loosely packed than in a solid and are able to flow around each other, giving the liquid an indefinite shape.
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Therefore the liquid will conform to the shape of its container.
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There!
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So cats must be liquid.
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If I sit, I sit.
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In a gas, the particles have tons of space between them and high kinetic energy.
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Like we'll see with this smoke machine, a gas has no definite shape or volume.
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If uncontrolled, the particles of a gas will spread out indefinitely, like this.
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If confined, the gas will expand to fill its container.
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Let's observe this with some smoke-filled bubbles.
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The smoke is a gas we can see and the bubbles are a flexible liquid.
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As they stretch around the gas, they trap it.
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The bubble becomes a container for the gas.
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When they pop, the gas is released and dissipates.
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Understanding that because gas is matter, it must have weight in mass is a hard concept to understand unless you can see it.
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So I have a really simple way for us to observe this in action.
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This is a balance I've created with paper bags on both ends.
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Right now, both of these bags are filled with the same mixture of gases, the same gas that I'm breathing in right now, but let's change that.
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Now that we're goggled up, we're going to combine two very common substances, baking soda and vinegar.
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This chemical reaction creates carbon dioxide gas that we will pour into this bag.
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Do you see it going down just a little bit?
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As the carbon dioxide gas sinks into the bag, it's heavier than the mixture of gases on the other end.
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If you're still here liking this video, hit that subscribe button so you never miss an episode.
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You may have heard of or even observed ooblick first hand.
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It's a non-Newtonian fluid, a term for fluids that change viscosity or how easily they flow under stress.
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When you allow ooblick to flow through your fingers, it acts like a liquid, but if you apply rapid force, solidifies and can even tear.
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Adding or removing energy from matter causes a physical change, as matter moves from one state to another.
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For example, removing energy from liquid water causes it to become ice,
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a solid, and adding thermal energy or heat to liquid water causes it to become a vapor or a gas.
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This energy either strengthens or weakens the force holding the molecules together or the kinetic energy the particles have.
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We can observe this happening with these glow sticks.
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I have these three glow sticks that are all the same color and temperature.
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I've already cracked them open and started the chemical reaction.
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That's what makes them glow.
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If you want to learn the science behind this reaction, you can check out this video.
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You might be able to see already that there are different temperatures in each one of these glass containers.
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In this one we have cold water with ice, this is room temperature, and this is hot water.
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Let's see how the glow sticks change behavior when we place them in each container.
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We're going to wait for five minutes and see what changes.
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You can't see the differences too well because of all of these lights so let's take care of that.
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You can see a difference, especially here between the hot water and the cold water.
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Why do you think this happened?
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First, let's get these lights back on.
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Much better.
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Chemical reactions happen slower at lower temperatures and faster at higher temperatures
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because the molecules are moving faster at higher temperatures and slower at lower temperatures.
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The more heat energy, the more movement or kinetic energy that the molecules have.
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When heat is applied to a solid, its particles begin to vibrate faster and its particles begin to move farther apart.
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When the substance reaches a certain combination of temperature and pressure,
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its melting point, the solid will begin to melt and turn into a liquid.
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When heat is removed, the opposite happens.
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The particles slow down and move closer together.
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If enough heat is removed, the substance begins to freeze.
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When a solid is converted directly into a gas without going through a liquid phase, the process is known as sublimation.
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A few volatile substances will undergo sublimation at room temperature and pressure, such as frozen carbon dioxide or dry ice.
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The dry Ice is a solid, but you can see that gas coming off of it and crawling over the surface of the desk.
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Vaporization is the changing of a liquid to a gas
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and can occur through either evaporation or boiling like we're attempting to do right here.
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Because the particles in a liquid are in constant motion, they frequently bump into each other and each collision causes energy to be transferred.
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Once enough energy is transferred to particles here near the surface, they may be knocked completely away as free gas particles, as you can see right here.
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Condensation occurs when gas loses energy and the particles come together to form a liquid.
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For example, water vapor condenses into liquid water on the outside of your glass on a warm day.
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The warm water vapor bumps into the side of the cold glass and forms these little drops of water.
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Matter is changing state all around you.
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See how many examples you can find today.
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And if you want to learn more science, you can check out this video next.
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It's too intense.
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The ooblick is too intense.
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背景與上下文
在這段影片中，講解者探討了物質的三種主要狀態：固態、液態和氣態。通過生動的例子和實驗，解釋了這三種狀態的特徵及其運作原理。這對於學習英語的學生而言，不僅是科學知識的獲取，更是提高英語發音和英語口語練習的絕佳機會。掌握這類內容，能幫助學生在實際對話中更加自信。
日常交流中的五個重要短語
- This is water.（這是水。）
- Particles are packed tightly together.（粒子緊密排列在一起。）
- Particles have high kinetic energy.（粒子具有高動能。）
- The gas will expand to fill its container.（氣體會擴充套件以填充它的容器。）
- Conform to the shape of its container.（適應容器的形狀。）
逐步跟讀指南
為了順利掌握影片中提到的內容和短語，可以按照以下步驟進行shadow speech或shadow speak練習：
- 觀看與聆聽：首先，仔細觀看影片，注意講解者的發音和語調。這一過程有助於你感受英語的韻律。
- 分段練習：將影片分成小段落，逐段進行重複練習。這有助於你集中精力，提高英語發音。
- 模仿與反饋：在跟讀時，試著模仿講解者的語氣和重音。如果有可能，可以錄下自己的聲音，與原影片進行對比，以便找出改進的地方。
- 應用所學短語：在日常交流中嘗試使用所學短語，例如提及固態、液態和氣態的特點。通過不斷使用，鞏固你的表達能力。
- 回顧與總結：最後，定期回顧已經掌握的內容，與你的學習夥伴分享理解與見解，進一步增強記憶。
藉助這種shadowing site方法，你將更有效地提高英語口語練習的能力，進而在實際交流中更加流暢自如。
影片中的語法
說話人最常用的結構，並附上影片中的原話：
| 結構 | 影片中的用法 |
|---|---|
| 條件句 if + 從句，will/would + 動詞 — 條件及其結果 | If confined, the gas will expand |
| 被動語態 be + 過去分詞 — 強調發生了什麼，而不是誰做的 | is made · are held · is released |
| 定語從句 who / which + 從句 — 補充說明人或事物 | atoms, which are · molecules, which are · density, which means |
| 現在完成時 have/has + 過去分詞 — 過去發生但與現在仍有關聯的事 | I've created · I've already cracked |
什麼是跟讀法？
跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。