Name: 紋身如何去除？| 紋身是如何去除的？ (How Tattoo Removal works? | #aumsum)
Uploaded: 2021-01-14T08:09:48.000Z
Duration: 5 min 30 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。

Can you guess the title of my next video?

Write your guess in the comments section below.

A permanent tattoo consists of various colored particles.

It can be removed with the help of lasers.

Lasers emit light of different wavelengths.

The colored particles absorb these wavelengths of light, get heated up and break into smaller pieces.

Making it easy for immune cells to eat and excrete them out, thus removing the tattoo.

Now, since every color absorbs a specific
wavelength more than the other.

Different colors need different laser wavelengths.

Black color is easiest to remove because it absorbs almost all wavelengths.

However, other colors like red, green, orange, blue, etc. require special lasers.

The air we breathe has many gases out of which 21% is oxygen.

When we inhale, much of the oxygen present in air binds to the hemoglobin in red blood cells.

Is transported to various cells where it helps to produce energy.

However, some inhaled oxygen also turns into free radicals.

Free radicals are highly unstable and can
be harmful.

Hence, our body produces antioxidants that neutralize the free radicals.

But if we inhale pure oxygen for a long time, then the number of free radicals increases.

It becomes difficult for the antioxidants
to neutralize them.

Hence, these unstable free radicals begin to bind with proteins in red blood cells.

As a result, our immune system doesn't recognize the red blood cells and begins to kill them.

Besides this, free radicals even damage the DNA which can lead to cancer.

At home, we generally use room temperature tap water to make ice.

Water has many dissolved minerals, gases, etc. which are invisible to our naked eyes.

On freezing this water, its temperature starts dropping and ice starts to form from outside.

Hence, the minerals and gases no longer remain dissolved.

But, as they cannot escape out, they get pushed towards the unfrozen center.

Eventually, when the center freezes, the trapped minerals and gases become visible.

Now, to avoid this situation, some specialized ice makers make ice slowly layer by layer.

In this technique, water is made to continuously flow over the surface of a cool container.

Thus, water begins to freeze from the bottom of the container, layer by layer.

Giving the minerals  and gases time to escape from the top, making ice clear.

Snoring is a noisy rattling sound occurring
during sleep.

I thought snoring is a pleasing piano sound.

Snoring is basically caused due to obstruction of air in our respiratory tract during breathing.

We take in air through nose or mouth which then passes down the throat into the lungs.

Our mouth parts like soft palate and uvula keep this tract wide open, allowing air to pass easily.

However, excess growth of soft palate and
uvula in some people causes snoring.

So, when these people sleep, these parts fall on the back of their throat, creating an obstruction.

Hence, when they inhale, the air hits these
parts making them vibrate, which we hear as snoring.

According to a popular belief, people think
that cats purr when they are happy and satisfied.

But did you know that cats purr in other situations also?

Imagine a cat falls from a height and injures her bone.

In such a situation also, the cat starts purring to heal her bones.

It is found that exposure to frequencies between 20 Hertz and 50 Hertz builds bone density.

The frequency of a cat's purr falls within
the range of 25 Hertz to 150 Hertz.

So, it is possible that a cat who has injured her bone might be purring to build bone density.

In addition to this, cats also purr when they
are stressed or feeling very hungry.