So I get that a Planck length is the smallest length measurement that we have. But why?
I know it has something to do with gravity and speed of light in a vacuum. But why? Is it the size of the universe as early as we can calculate prior to the Big Bang? What is significant about it?
All the videos I see just say it’s a combination of these three numbers, they cancel out, and you get Planck length – and it’s really really small. Thanks in advance!
In: Physics
>So I get that a Planck length is the smallest length measurement that we have.
Misconception. It is the smallest measurement that we can do anything with with accuracy because once your go smaller, quantum uncertainty kicks in.
>I know it has something to do with gravity and speed of light in a vacuum.
It is calculated using 3 constants. Gravitational Constant, Speed of Light and Planc’s constant.
>Is it the size of the universe as early as we can calculate prior to the Big Bang? What is significant about it?
No, has nothing to do with it. It is just a threshold to tell us we can’t calculate things with accuracy if the length is smaller than a Planc length.
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