There is easily squeezed broken shell eggs?

You may think that it is childish! Don't be hasty, though thin, but the shell of a regular egg is not too svelte. Want to crush by squeezing its two ends into the palm of your hand, you must "work" relatively.

Is breaking the egg easy?

It was the protrusion of the eggshell that made it so incredible. The cause of the phenomenon is the same as the durability of the following arched doors :

In the picture is a stone-built window like that.The weight S (ie the weight of the parts above the wall) on the stone with a wedge in the middle of the arch will be pressed down under a force, represented by the arrow A on the drawing. But the shape of the stone's wedge makes it impossible to fall below it, but it can only be pressed on the stones next to it. Here force A can be analyzed as two forces B and C, according to the parallelogram rule . These forces are in balance with the resistance of the stones attached to each other, and in turn each stone is subjected to the compacting of the surrounding stones. Thus the force from the outside pressing on the rolling door will not break the door.

However, the force exerted from the inside can knock this door relatively easily. The reason is easy to understand: the wedge shape of the stones just keeps them from falling down, not stopping them from going up at all.

The shell of the egg is just the same door, just that it is composed of a seamless layer. When there is pressure from outside, it is not easy to break apart as we thought. It is possible to place a rather heavy chair based on 4 live eggs that still do not break. Now you probably understand why the mother chicken body is also quite heavy, but when it comes to the drive does not break the egg, while the weak chick at the hatch can use the mine to easily break the outer shell. .

The bizarre sustainability of electric light bulbs - things that appear very thin and crunchy at first - are also interpreted as the sustainability of eggshells. Their sustainability also surprises us even more, if you remember that there are light bulbs inside that are absolutely vacuum , nothing can resist the pressure of outside air. Yet the magnitude of the air pressure on an electric light bulb is not small: a bulb of 10 cm diameter is subjected to a force of over 700 N (equal to the weight of a person) pressed from all sides. The vacuum bulb is more " tall" , it can withstand a pressure greater than 2.5 times the pressure.