/u/corrrrallll's posts in /r/askscience

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The definition of a second is "the duration of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom." How/why was this (seemingly arbitrary) value chosen?

1605 upvotes

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Are there any significant effects of entanglement observed on a regular basis in nature?

86 upvotes

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If three cylinders intersected, would the intersection be a sphere.

6 upvotes

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What do physicist mean when they say "unification of forces"?

5 upvotes

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Quarks can't be separated because the energy required to pull them apart would create new quarks. What causes the energy to turn into the correct types of quarks to pair off with the originals?

4 upvotes

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How do theorists come up with mathematical models?

3 upvotes

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Is there a superset of the complex numbers?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
The definition of a second is "the duration of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom." How/why was this (seemingly arbitrary) value chosen?	1605
Are there any significant effects of entanglement observed on a regular basis in nature?	86
If three cylinders intersected, would the intersection be a sphere.	6
What do physicist mean when they say "unification of forces"?	5
Quarks can't be separated because the energy required to pull them apart would create new quarks. What causes the energy to turn into the correct types of quarks to pair off with the originals?	4
How do theorists come up with mathematical models?	3
Is there a superset of the complex numbers?	3