Name: 塑膠梳子是如何吸引紙張的？ 再加上10多個視頻......#aumsum (How does a plastic comb attract paper? plus 10 more videos... #aumsum)
Uploaded: 2021-01-14T08:11:07.000Z
Duration: 25 min 32 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。

Take a plastic comb and bring it close to some pieces of paper.

Rub the comb on your dry hair and then bring the comb close to the pieces of paper.

The pieces of paper got attracted to the plastic comb.

No, the reason behind this is electric charge.

Electric charge is the quantity of electricity held in an object.

There are 2 types of electric charges, positive and negative.

However, there are some objects where the positive and negative charges are equal to one another.

In such cases, we say that the object is electrically neutral.

So, was the plastic comb initially electrically neutral or electrically charged?

Initially, the plastic comb was electrically neutral.

That means it had equal number of positive and negative charges.

Hence, it did not have the ability to exert a force and attract the pieces of paper.

So, after rubbing the plastic comb on our dry hair, why was it able to attract the pieces of paper?

When we rubbed the plastic comb on our dry hair, it gained an electric charge.

Once it got electrically charged, it got the ability to exert a force on the pieces of paper and attract them.

This charge is called as static electricity.

However, do you think, like a plastic comb, a metallic comb will also attract the pieces of paper?

A metallic comb will not attract the pieces of paper like the plastic comb.

It is because plastic is not a good conductor of electricity.

It does not allow the electric charges to flow through it onto the earth.

As a result, the charges build in the plastic comb.

Making it electrically charged and enabling it to attract the pieces of paper.

However, metal is a good conductor of electricity.

It allows the electric charges to flow through it onto the earth.

Thus, not allowing the metallic comb to get electrically charged.

As a result, the metallic comb does not attract the pieces of paper.

Put this baking soda solution on the bee stung area.

This happened because a neutralization reaction took place when we applied baking soda on the stung area.

The venom of a honey bee contains formic acid.

When it stings us, it injects that acid into our skin.

Formic acid causes immense pain and irritation.

However, when we apply baking soda solution, which is a mild base, on the stung area.

It neutralizes the formic acid and cancels its effect.

As a result, the sensation of pain and irritation decreases and we get some relief.

Such a reaction between an acid and a base is called neutralization.

In neutralization, both acidic and basic solutions neutralize the effect of each other.

The nature of both acids and bases gets destroyed.

It looks similar to a honey bee but it is a bit longer.

Applying the baking soda is not going to help.

Pour this vinegar on the stung area, you will get some relief.

Why do you think the baking soda solution did not help in this case?

Earlier, in case of the honey bee, we learnt that its venom is acidic.

Hence, baking soda, being a basic solution helped to neutralize the effect

Now, in case of a wasp, the nature of its venom is basic.

When it stings us, it injects that venom into our skin.

Now, baking soda is also a basic solution.

Hence, it will not provide any sort of relief.

However, when we pour vinegar, which is a mild acid, on the stung area.

The acid, that is, vinegar and the base, that is, the wasp's venom get neutralized.

As a result, the sensation of pain and itching decreases and we feel better.

Why is nuclear fusion not used to generate electricity?

You really want to know the answer to this, right?

Before answering the question, let us understand what is meant by nuclear fusion.

When two lighter nuclei combine to form a heavy nucleus, a large amount of energy is released.

Where does this nuclear fusion take place?

You think that it takes place in a laboratory?

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塑膠梳子是如何吸引紙張的？再加上10多個視頻......#aumsum (How does a plastic comb attract paper? plus 10 more videos... #aumsum)

sensation

force

amount

neutral

塑膠梳子是如何吸引紙張的？ 再加上10多個視頻......#aumsum (How does a plastic comb attract paper? plus 10 more videos... #aumsum)

sensation

force

amount

neutral

塑膠梳子是如何吸引紙張的？再加上10多個視頻......#aumsum (How does a plastic comb attract paper? plus 10 more videos... #aumsum)