The reason 'you're still peaceful' when walking barefoot on glass, embers

Do you think that walking barefoot on a piece of glass is really scary?

Going barefoot on glass is not as dangerous as you think?

Recently, the image of a high school student walking barefoot on a carpet of glass scattering public opinion. Many people believe that this act of " showing courage " is really dangerous for even adults.

But the truth is, is this action really dangerous when in the past there were many cases of barefoot walking through glass or even coal that was hot red and still unharmed? The following article will answer your questions.

Surely when asked to walk through a carpet of glass fragments, many people were afraid to think about the prospect of being pierced by thousands of sharp glass pieces. However, in fact, there were many people barefoot on glass chips that were okay. Why is that?

Step barefoot on a piece of glass

In fact, there is no mystery here but all it is is a simple physical phenomenon called 'pressure '. The physical pressure is the pressure per unit of area applied perpendicular to the object. In this case, the force is calculated based on weight.

If you just stepped on a piece of sharp glass, the pressure would be very large because the entire body's gravity would end up on a single piece of glass - this force was large enough to pierce our skin.

A sharp piece of glass can easily penetrate balloons.

However, when stepping on many pieces, the pressure will now be spread evenly on each part of skin exposed to the glass. The pressure also follows that, which decreases many times, helping us to ' have peace of mind'.

When the pressure is spread evenly, a ball won't break no matter how hard we try to compress them.

Similarly, we can even stand barefoot, even sleeping on a table without any problems.

People can even sleep on thousands of sharp nails

The most important thing to remember before stepping through glass or stepping on a table is to be confident. With that, you need to set your feet straight, slow and perpendicular steps so that the pressure is evenly spread. At this time, barefoot on glass pieces will no longer become as scary as many people think.

The video below can help you get a better idea of ​​this.

. and "art" barefoot on embers

You have good, barefoot on the embers is the practice of many countries around the world. In India in 1,200 BC, walking on embers is a ritual that challenges human strength and courage.

In Japan , the fire walking festival is held in March every year and is a practice that is said to bring good luck. Even in Vietnam, the step on coal is also a long tradition of some ethnic groups such as Pha Card (Ha Giang) after each bumper harvest.

Step barefoot on red hot coal 500 degrees C (Artwork)

Not only that, these layers of coal are usually hot at about 500 degrees Celsius when hot red. Will their feet be " burned" immediately if they walk on this layer of coal?

The truth is that those who walk on embers are still completely peaceful. Explaining the phenomenon of walking on coal without foot burns, physicists say that temperature is just one of many factors related to heat transfer, in addition to an important index - the heat discharge index and contact time.

In physics, the thermal discharge index is calculated based on specific thermal conductivity, density and heat capacity. The thermal discharge coefficient of coal determines whether the heat transmitted to our feet causes burns.

In coal steps, people often use charcoal , which has low thermal conductivity, density and heat capacity. If the person walking on the charcoal is fast enough, the contact time between the coal and the foot is small enough, the amount of heat exchanged may not be so high as to cause burns.

Besides, because the foot is holding many blood vessels , during the time when the foot is removed from the coal between steps, the blood flow will spread the amount of heat that the foot absorbs. At the same time, when coal cools, there will be a layer of carbon black insulation, which will help prevent the risk of burns.

Few doubts that soot is a fairly good insulation.

Not only that, to ensure safety, many places also apply some tricks. Most commonly, it is to wet the front legs . Because the steam has a low heat capacity and poor thermal conductivity, when walking, the steam rises up to form a protective layer at the foot.

Even as the ancient Chinese after stepping their feet into the water, they stepped through the sand. The sand that attaches to the foot also contributes to an insulation layer, making it easy to walk.

However, compared to glass, going over embers is much more frightening. If you do not exercise well, or are not confident enough to step quickly, the heat will be large enough to make your foot burn badly .

* Going on glass and embers requires instruction and practice, you should not try on your own.