Why does the body easily carry static electricity? Teach you scientific anti-electric shock skills!

Door handles, faucets, and even inadvertently touching another person... During winter, getting shocked by static electricity seems to have become a common occurrence.

But who is this static electricity, and why does it seem to favor us? And how can we guard against these sudden "electric shocks"?

So, what exactly is static electricity?

To unlock the mystery of static electricity, we must first start with the basic composition of matter: atoms.

At the center of each atom sits a heavy atomic nucleus, surrounded by several subatomic particles rotating around it. These little guys are electrons. The atomic nucleus itself is composed of two types of subatomic particles: protons and neutrons.

All subatomic particles carry their inherent physical properties, such as mass, spin, and charge. When we talk about static electricity, it is the charge carried by these subatomic particles that truly matters.

Charge comes in two types: positive and negative. Each electron carries one unit of negative charge, while each proton carries one unit of positive charge.

Under normal circumstances, the number of electrons and protons in an atom is equal, so the entire atom exhibits electrical neutrality.

However, charged particles interact with each other, generating a force called electrostatic force. This force makes opposite charges (i.e., positive and negative charges) attract each other, while like charges repel each other.

Inside an atom, the electrostatic force keeps electrons moving stably around the atomic nucleus. But interestingly, the electrostatic force's binding ability weakens for electrons farther away. Therefore, those electrons far from the atomic nucleus sometimes "run away from home," causing the atom to take on a positive charge due to more protons than electrons, while the object that gains the extra electrons takes on a negative charge.

This state of charge imbalance is what we call static electricity.

So, why do electrons leave an object?

Actually, there's a simple way to generate static electricity: friction.

For some materials, just a small amount of energy is needed for electrons to detach from atoms in large numbers. Sometimes, simple friction is enough.

Of course, besides friction, many other ways can also cause electrons to detach from their original objects. Moreover, the electrons of many materials are quite "free."

Why do our hands get shocked?

Now, suppose your hands are charged with static electricity. When you touch a surface with a different static charge, electrons will transfer—from the negatively charged object to the positively charged one.

This process of electron transfer forms a tiny and brief current, which is what we commonly call static discharge. When the current is sufficiently strong instantaneously, you will feel that familiar electric shock.

It's worth noting that the human body usually tends to carry a negative charge because our bodies are more likely to gain electrons through friction and other means.

Furthermore, the human body is a good conductor. The clothing we wear, during friction processes such as the friction between shoes and the ground or between clothing items during activity, can easily conduct electrons to our bodies if they gain them.

Regardless of the type of static charge the human body carries, when it comes into contact with another conductor, it is more prone to static discharge, thus making us feel the shock.

This is because conductors can effectively transfer charges, especially metallic conductors, which can rapidly redistribute their charges to neutralize those on the human body.

What can I do to prevent static shocks?

Actually, several factors influence the frequency and intensity of static electricity generation, including personal sensitivity, body size, clothing material, ambient temperature, and air humidity.

The voltage of static electricity can sometimes reach several thousand volts, but its duration is usually very brief, so it is generally harmless to the human body. However, some people are inherently more sensitive to electric shocks and may therefore feel more affected by static electricity.

Additionally, larger individuals need to accumulate more electrons to achieve the same current effect, so they may be more prone to electric shocks compared to smaller individuals.

These two factors are mainly determined by individual conditions and cannot be easily changed. But we can reduce static shocks by adjusting clothing material, improving the environment, and being cautious when touching objects.

First, dry and cold air increases the probability of static electricity generation, which is why we frequently encounter static electric shocks in winter.

This is because, compared to humid and warm air, dry and cold air has poor conductivity, making it harder for electrons to be conducted through the air and more likely to accumulate on the human body, forming a charge.

Therefore, an effective way to reduce static electricity is to try to keep the body moist. If conditions permit, you can also use a humidifier to increase indoor humidity.

Besides air humidity, the main way for human body static charges to dissipate is through contact with the ground. Therefore, the type of shoe sole is also particularly important. Materials that are completely insulating—such as rubber soles—tend to make the human body more prone to accumulating static charges.

So, the second method to reduce static electricity is to choose appropriate shoe sole materials. Try to avoid wearing shoes with rubber soles to reduce the risk of static charge accumulation.

The third method is to keep a coin in your pocket. Before touching items that may produce an electric shock, first touch them with the coin to discharge the static charge from your body.