Name: 為什麼海水是鹹的？| 海水為什麼是鹹的？ (Why is Ocean water Salty? | #aumsum)
Uploaded: 2021-01-14T08:10:40.000Z
Duration: 6 min 17 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

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Write your guess in the comments section below.

Several natural processes make ocean water salty.

For example, when it rains, the water droplets react with carbon dioxide in the atmosphere Form carbonic acid.

This acidic rainwater reacts with minerals
present in the rocks and forms new minerals and salts.

These minerals and salts are then carried by flowing water to the oceans, thus making the ocean water salty.

In addition to this, along the mid-ocean ridges, magma rises close to the oceanic crust.

Here, when the salty ocean water seeps into the earth's crust, it gets hot due to magma.

This hot water dissolves more minerals present in the crust and carries them to the oceans.

Through fissures called hydrothermal vents, thus making the ocean water salty.

Now when we breathe, we inhale oxygen rich air and exhale carbon dioxide rich air.

However, as the lungs are warm and moist, the exhaled air is warm and has more moisture in the form of water vapor.

In cold months, when this warm and moist exhaled air comes in contact with the cool air.

The moisture in the exhaled air condenses to form tiny water droplets.

Thus, we can see these tiny water droplets
as cloud or fog in our breath.

A sound comprises of several frequencies.

However, some people have a greater sensitivity to higher frequencies in a sound.

While others have a greater sensitivity to lower frequencies.

I have a greater sensitivity towards chocolates.

In this audio clip, the higher frequency forms the sound Yanny and the lower frequency forms Laurel.

So, if you have a greater sensitivity to higher frequencies, then you will probably hear Yanny.

Whereas, if you have a greater sensitivity
to lower frequencies, then you might hear Laurel.

In addition to this, age could also affect
the frequencies we hear.

This is because as we age, we begin to lose our ability to perceive higher frequencies.

Hence, older people tend to hear Laurel, while younger people hear Yanny.

Our core body temperature is about 37 degrees Celsius or 98.6 degrees Fahrenheit.

To maintain this temperature, our blood transports warmth to all our body.

But prolonged exposure to cold temperatures can decrease our core body temperature.

Now, our brain constricts the blood vessels
of our limbs.

Diverting blood to the vital organs to maintain their core temperature.

As our limbs don't get sufficient warmth,
they start to freeze, giving us frostbite.

First is frostnip in which the surface of
our skin freezes.

During second stage called superficial frostbite, often ice crystals form in the skin.

During third stage, i.e., deep frostbite,
the underlying tissues, blood vessels, bones, etc.

Why does sound travel faster in summer than in winter?

The television switched on immediately after you clapped.

Now, I bet you that the television will not
switch on instantly after your clap.

Do you know why the sound took more time to reach the television?

This is because the speed of sound decreased.

Speed of sound depends on the temperature of the medium.

Higher the temperature of the medium, more will be the speed of sound and vice versa.

So, in this case, what do you think is the
medium?

During summer season, the temperature of air increases.

At higher temperature, the molecules of air
have more kinetic energy.

Hence, they vibrate faster leading to increase in speed of sound.

Now, during winter season, the temperature of air decreases.

With decrease in temperature, the kinetic
energy of the molecules also decreases.

Hence, the molecules do not vibrate much.

As a result, the speed of sound decreases
during winter season.

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為什麼海水是鹹的？| 海水為什麼是鹹的？ (Why is Ocean water Salty? | #aumsum)

perceive

present

vital

slightly