Shadowing Practice: How To Clear Icy Roads, With Science - Learn English Speaking with Video
Kies een oefenmodus
Elke modus opent een volledig scherm oefenruimte.
82 zinnen
Als zinnen te kort of te lang zijn, klik op Bewerken om ze aan te passen.
1
Navigating an icy road can be pretty dangerous.
2
And while applying a coating of salt is the time -tested method for rendering a frozen highway drivable, that salt has major downsides.
3
It's toxic for plants, wildlife, and freshwater ecosystems.
4
It contaminates our drinking water and air quality.
5
It can even damage our cars, which feels a bit counterproductive.
6
So how do we make winter roads safe for both drivers and the environment?
7
Well, science says we have options.
8
Salting a road is by far the most common de -icing technique.
9
When salt mixes with water, the resulting solution has a lower freezing temperature than water by itself.
10
However, this is true for all kinds of solutions, not just salty ones.
11
Thanks to a scientific principle called freezing point depression,
12
the temperature at which plain H2O freezes is always higher than its freezing point when something is dissolved into it.
13
Essentially, the salt keeps water molecules from forming solid ice crystals because the salt interrupts the watery ice structure.
14
The temperature at which the salty water eventually freezes depends on how salty the solution is.
15
And although salting roads with the classic sodium chloride is effective, it wreaks havoc on plants and wildlife, contributes to poor air, soil,
16
and water quality, ruins infrastructure like water treatment plants and bridges, and corrodes our stuff, like the steel in cars.
17
Which is why some places are experimenting with a few solutions to this chili conundrum.
18
We can start simple.
19
Even a different kind of salt can make a difference.
20
The sodium chloride you put on your food is chemically the same as the rock salt
21
or halite that's spread on roads to melt ice.
22
It's cheap, effective, and the infrastructure for delivering it to roads is already in place.
23
The problem is that the chlorides in the sodium chloride don't ever break down in the environment.
24
But other salts are better for the environment, if only
25
because less is required in solution to achieve the same freezing point depression we get with a higher concentration of sodium chloride.
26
Remember, a salt is just any compound that has positive and negative ions, which together make a neutral charge.
27
There are a lot of options for what salts you can use.
28
For instance, magnesium chloride and calcium chloride lower the freezing point more effectively due to some interesting chemistry.
29
When sodium chloride dissolves in water, it dissociates into two ions, Na -plus and Cl -minus.
30
Magnesium chloride and calcium chloride, on the other hand,
31
dissociate into three ions each since they're each made of three total atoms instead of the two in NaCl. And
32
because the number of dissolved particles in a solution is what determines how low the freezing point of a solution can get,
33
salts like calcium chloride can do the same job as sodium chloride while using less raw salt to do it.
34
Some states like Connecticut have used magnesium chloride salts for de -icing, citing the lower cost of the solution.
35
However, there is a downside.
36
They're still somewhat corrosive to cars, making them less than ideal.
37
And these salts are also bad for the environment when they accumulate.
38
It just doesn't happen as fast as with sodium chloride, because less is needed to do the job.
39
Figuring out which ions react with what can be a major chemistry puzzle.
40
And you can find more of those at Brilliant, the online learning platform with thousands of lessons in science,
41
computer science, and math, and the sponsor for this video.
42
Their Chemistry and Biology Puzzles course takes interactive learning to the next level, with 28 quick lessons full of puzzles that keep you engaged.
43
Some of those puzzles cover the basics of chemical reactions
44
that can help you follow along with all of the ions I just rattled off,
45
while others pose environmental questions for things like finding a cleaner burning fuel.
46
You can try them all for free for 30 days at brilliant .org slash scishow, or by clicking the link in the description down below.
47
That link also gives you 20 % off an annual premium Brilliant subscription.
48
So, if your ears perked up at the mere mention of the environment, just wait until you hear about this next de -icing alternative.
49
Of course, there are other options beyond salts for de -icing roads.
50
Some state road agencies have tested all kinds of weird stuff.
51
– cheese brine, pickle juice, beet juice, and… pig pee, to name a few?
52
Welcome to the wild world of potentially eco -friendly methods for melting road ice.
53
Byproducts from vodka distilleries or sugar beet processing facilities contain a lot of sugars, which, when added to road salts,
54
helps lower the melting point of the ice, meaning the salt will work better at even lower temperatures.
55
But not all eco -options are created equal.
56
For instance, some communities have complained about the smell from that beet wastewater,
57
water, and some research shows that distillery byproducts can also cause some of those ecosystem problems that we're trying to avoid.
58
Urea is also marketed as an eco -friendly solution to road salt,
59
since it's also water -soluble and makes a solution with a lower freezing point than pure water.
60
And while urea is great at de -icing and is generally safe for pets and children to be around, there are some downsides.
61
It doesn't perform well below negative 4 degrees Celsius, and once it gets into a waterway, it decreases dissolved oxygen and causes algal blooms.
62
Plus, urea is actually somewhat expensive, at least compared to the other options out there.
63
Still, there's definitely a market for more of these less harmful options for de -icing.
64
The other way to help de -ice our roads is also the way to make pickles.
65
Brine.
66
But I'm not talking about your leftover pickle juice.
67
Brine is just water that's got a lot of salts dissolved in it.
68
And using brine on the roads is a pretty neat way to prevent the ice from forming in the first place.
69
When you de -ice a road that's already been snowed upon,
70
transportation agencies use wet rock salt to break the bond between the ice and the road, making it safer to drive.
71
But the idea behind the brine is to apply liquid salt to the road ahead of time.
72
Some places have started brining the roads with liquid salt solution before the snow or ice shows up.
73
This limits the amount of ice that can form on the road to begin with, and uses about a quarter of the salt of de -icing.
74
Brining requires a lot of infrastructure and planning.
75
A community needs trucks with big tanks and pumps to spray the brine onto the pavement's surface.
76
This stuff can be expensive.
77
However, communities that have invested in brining roads have reported reducing the overall cost of maintaining winter roads,
78
even after accounting for the extra equipment and staffing.
79
And the reason for the savings is simple, they're just not buying as much salt.
80
So, while nothing is perfect, there are absolutely some ways we can move ahead on making our roads safer and more eco -friendly.
81
Let's just hope they don't all smell like pig pee.
82
Thanks for watching.
App downloaden
Alles wat je nodig hebt om vloeiend te spreken
AI UitspraakScoor elke zin
IPA OefeningBeheers elk geluid
WoordenschatBouw je woordenschat op
WoordenspelLeren terwijl je speelt
Zelfde Kanaal
C1Two Different Things Are Killing Sharks
American AccentDaily ConversationUniversity Students
C113
Why Do We Sneeze?
American AccentIELTS PrepTOEFL PrepUniversity Students
C1The Science That Finally Explains the Dyatlov Pass Incident
American AccentDaily ConversationUniversity Students
C13
4 Supervolcanoes You’ve Never Heard Of
American AccentDaily ConversationUniversity Students
C13
The Science Behind The Odyssey's Greatest Challenge
American AccentIELTS PrepTOEFL PrepUniversity Students
C12
5 Gross Gifts Animals Give Their Mates
American AccentDaily ConversationUniversity StudentsWorking Adults
B26
What’s Ruining Our Ruins?
American AccentIELTS PrepTOEFL PrepUniversity Students
C1Ticks Can Spread An Allergy To… Red Meat?
American AccentIELTS PrepTOEFL PrepUniversity Students
B21
Do Penguins Control the Weather?
American AccentIELTS PrepTOEFL PrepUniversity Students
C12
The Most Important Picture in the History of Science
American AccentIELTS PrepTOEFL PrepUniversity Students
C15
Why Can’t We Have Unicorns?
American AccentKids
B2Does Aloe Really Treat a Sunburn?
American AccentDaily ConversationUniversity StudentsWorking Adults
C1What's Really Behind The Adderall Shortage?
American AccentIELTS PrepTOEFL PrepUniversity Students
C1The ONE Disease That Smoking Can Help Treat
American AccentIELTS PrepTOEFL PrepUniversity Students
C1How Onions ACTUALLY Make You Cry (And How to Stop Them)
American AccentDaily ConversationUniversity StudentsWorking Adults
FOR YOU
Aanbevolen Video
C11
69 zinnen
How An Igloo Keeps You Warm
Daily ConversationUniversity StudentsWorking Adults
C16
124 zinnen
How to design streets for everyone (Universal Design)
Daily ConversationUniversity StudentsWorking Adults
C13
94 zinnen
How a Country With Zero Rivers Drinks Water (Saudi Arabia)
Daily ConversationUniversity StudentsWorking Adults
C12
193 zinnen
What Would Happen If an Asteroid Hit the Ocean?
Daily ConversationUniversity StudentsWorking Adults
C14
59 zinnen
How Can You Change Somebody's Opinion?
Daily ConversationUniversity StudentsWorking Adults
C12
483 zinnen
Essentials: Cold & Heat Exposure for Metabolic Health | Dr. Susanna Søberg
Daily ConversationUniversity StudentsWorking Adults
C17
41 zinnen
RE2 Unit 10A
Daily ConversationUniversity StudentsWorking Adults
C13
70 zinnen
How China is designing flood-resistant cities
Daily ConversationUniversity StudentsWorking Adults
B14
5 zinnen
The Best Way To Dice An Onion 😮
Daily ConversationHigh School StudentsUniversity Students
B19
113 zinnen
Warm Water vs. Cold Water: The Cleaning Truth
Daily ConversationUniversity StudentsWorking Adults
C13
330 zinnen
Why Cold Drinks Were Deadly Before 1914
Business EnglishUniversity StudentsWorking Adults
C12
56 zinnen
What if the world runs out of sand? | The Royal Society
Daily ConversationUniversity StudentsWorking Adults
Woordenschat en spreektips bij deze les
Deze spreekles is gebaseerd op de video “How To Clear Icy Roads, With Science”. Deze woorden komen het vaakst terug: salt, road, chloride, solution, ice. Deze video bevat 60 zinnen en 1197 woorden om na te spreken. Het gesproken deel duurt 6:02. De spreker praat snel, ongeveer 198 woorden per minuut, dus reken op verbonden en ingeslikte klanken. Slechts 78% van de woorden hoort bij de 3.000 meest gebruikte Engelse woorden, dus de woordenschat is pittig.
Belangrijke woorden in deze video
15 woorden uit de video die het leren waard zijn, met uitspraak en betekenis:
| Woord | Uitspraak | Betekenis |
|---|---|---|
| freeze werkwoord | /ˈfɹiːz/ | bevriezen |
| sodium zelfstandig naamwoord | /ˈsəʊ.di.əm/ | natrium |
| ion zelfstandig naamwoord | /ˈaɪ.ɑn/ | ion |
| puzzle zelfstandig naamwoord | /ˈpʌzəl/ | mysterie, raadsel |
| infrastructure zelfstandig naamwoord | /ˈɪnfɹəˌstɹʌkt͡ʃə/ | infrastructuur |
| juice zelfstandig naamwoord | /d͡ʒuːs/ | sap |
| chemistry zelfstandig naamwoord | /ˈkɛm.ɪ.stɹi/ | chemie, scheikunde |
| melt werkwoord | /mɛlt/ | smelten, laten smelten |
| calcium zelfstandig naamwoord | /ˈkælsi.əm/ | calcium |
| salty bijvoeglijk naamwoord | /ˈsɔlti/ | zout |
| downside zelfstandig naamwoord | /ˈdaʊnˌsaɪd/ | nadeel, keerzijde |
| lesson zelfstandig naamwoord | /ˈlɛs.ən/ | les |
| liquid zelfstandig naamwoord | /ˈlɪk.wɪd/ | vloeistof |
| wildlife zelfstandig naamwoord | /ˈwaɪldlaɪf/ | wilde dieren, natuur |
| ecosystem zelfstandig naamwoord | /ˈikoʊˌsɪstəm/ | ecosysteem |
Phrasal verbs die je zult horen
| Woord | Betekenis |
|---|---|
| figure out werkwoord | uitvogelen, er achter komen |
| show up werkwoord | tentoonstellen |
Grammatica in deze video
De structuren die de spreker het meest gebruikt, met de exacte woorden uit de video:
| Structuur | In de video |
|---|---|
| Present perfect have/has + voltooid deelwoord — iets uit het verleden dat nu nog telt | have used · have tested · have complained |
| Lijdende vorm be + voltooid deelwoord — het gaat om wat er gebeurt, niet om wie het doet | is dissolved · is required · is needed |
Uitspraak om op te letten
De spreker gebruikt 9 samentrekkingen en verkorte vormen, zoals they're, doesn't, don't. Spreek ze kort uit, zoals je ze hoort.
- De klanken “sh” en “zh”: essentially /ɪˈsɛnʃəli/, potentially /pəˈtɛnʃ(ə)li/, concentration /ˌkɑn.sənˈtɹeɪ.ʃən/, subscription /səbˈskɹɪpʃən/, freshwater /ˈfɹɛʃˌwɔːtə(ɹ)/
- Lange woorden — let op de klemtoon: infrastructure /ˈɪnfɹəˌstɹʌkt͡ʃə/, ecosystem /ˈikoʊˌsɪstəm/, essentially /ɪˈsɛnʃəli/, potentially /pəˈtɛnʃ(ə)li/, experiment /ɪkˈspɛɹ.ə.mənt/
Klanken die Nederlandstaligen lastig vinden:
- Stemhebbende eindmedeklinker — /b/, /d/, /g/, /z/, /v/ niet verscherpen: freeze /ˈfɹiːz/, downside /ˈdaʊnˌsaɪd/, liquid /ˈlɪk.wɪd/, engage /ɪnˈɡeɪd͡ʒ/, productive /pɹəˈdʌk.tɪv/
- /æ/ — opener dan de Nederlandse “e”: calcium /ˈkælsi.əm/, math /mæθ/, react /ɹiːˈækt/, interactive /ˌɪn.tɚˈæk.tɪv/, atom /ˈætəm/
- /g/ — een harde plofklank, geen Nederlandse “g”: engage /ɪnˈɡeɪd͡ʒ/, navigate /ˈnæv.ɪ.ɡeɪt/, magnesium /ˌmæɡˈnizi.əm/, algal /ˈælɡəl/
Zo oefen je met deze video
- Luister de hele video één keer zonder te spreken en noteer de woorden die je niet kent.
- Begin op 0,75× snelheid, spreek zin voor zin na en ga terug naar normale snelheid zodra het makkelijk gaat.
- Neem jezelf op en vergelijk met het origineel; let daarbij op woorden als freeze, sodium, ion.
Wat is de Shadowing-techniek?
Shadowing is een wetenschappelijk onderbouwde taalleermethode die oorspronkelijk is ontwikkeld voor professionele tolkentraining en gepopulariseerd door polyglot Dr. Alexander Arguelles. De methode is eenvoudig maar krachtig: je luistert naar native Engelse audio en herhaalt het onmiddellijk hardop — als een schaduw die de spreker volgt met slechts 1–2 seconden vertraging. In tegenstelling tot passief luisteren of grammaticadrills, dwingt shadowing je hersenen en mondspieren om echte spraakpatronen tegelijkertijd te verwerken en te reproduceren. Onderzoek toont aan dat het de uitspraaknauwkeurigheid, intonatie, ritme, verbonden spraak, luisterbegrip en spreekvaardigheid aanzienlijk verbetert — waardoor het een van de meest effectieve methoden is voor IELTS Speaking-voorbereiding en echte Engelse communicatie.