What is Heisenberg’s Uncertainty Principle?

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Heisenberg’s cat remains silent

https://www.theguardian.com/science/2013/nov/10/what-is-heisenbergs-uncertainty-principle

 

“Perhaps the strangest result of the uncertainty principle is what it says about vacuums. Vacuums are often defined as the absence of everything. But not so in quantum theory. There is an inherent uncertainty in the amount of energy involved in quantum processes and in the time it takes for those processes to happen. Instead of position and momentum, Heisenberg’s equation can also be expressed in terms of energy and time. Again, the more constrained one variable is, the less constrained the other is. It is therefore possible that, for very, very short periods of time, a quantum system’s energy can be highly uncertain, so much that particles can appear out of the vacuum. These “virtual particles” appear in pairs – an electron and its antimatter pair, the positron, say – for a short while and then annihilate each other. This is well within the laws of quantum physics, as long as the particles only exist fleetingly and disappear when their time is up. Uncertainty, then, is nothing to worry about in quantum physics and, in fact, we wouldn’t be here if this principle didn’t exist.”

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About Kate Thwaite

I love writing , conversation, art, wild flowers, music and air.And books
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