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| By Hanna Bolanos
Learning to crack an egg is a culinary rite of passage. Do it correctly, and the shell swiftly breaks, spilling the liquid contents out in one fell swoop. Do it wrong, and you end up with yolk on your hands and shell in your bowl. Luckily, science has hatched a formula that is nearly infallible. All it requires is knowledge of a few basic physics principles.
To complete the perfect crack, you need to know where and with what
Like all objects, eggshells have breaking points, or limits beyond which
Now that you’ve found the cracking sweet spot, you need to make a swift
According to fracture mechanics, once you’ve created a crack in an object, that fissure will expand only slightly until you’ve applied the amount of force needed for the break to reach something called its critical crack length. Once achieved, the rift will grow rapidly as long as that force remains steady. If you’ve ever walked across a frozen pond of thin ice and watched a crack form beneath your feet, it’s the same basic idea. Soon after the critical crack length is reached, you fall through the ice. To successfully open an egg after cracking it, you have to apply the force necessary to the cracked edges for them to start and continue expanding. Be careful not to overdo it, though. Pulling the shell edges away from each other too harshly can result in shell destruction.
Ultimately, a clean, fast break across the egg-quator and some even-handed prying will save you a scrambled mess.