Editing Motion (section)

=== Quantum mechanics ===
[[Quantum mechanics]] is a set of principles describing [[Physical systems|physical reality]] at the atomic level of matter ([[molecule]]s and [[atom]]s) and the [[subatomic particle]]s ([[electron]]s, [[proton]]s, [[neutron]]s, and even smaller [[elementary particle]]s such as [[quark]]s). These descriptions include the simultaneous wave-like and particle-like behavior of both [[matter]] and [[radiation]] energy as described in the [[wave–particle duality]].<ref>{{Cite web |url=https://feynmanlectures.caltech.edu/I_38.html |title=The Feynman Lectures on Physics Vol. I Ch. 38: The Relation of Wave and Particle Viewpoints |access-date=2022-05-03 |archive-date=2022-08-14 |archive-url=https://web.archive.org/web/20220814175040/https://www.feynmanlectures.caltech.edu/I_38.html |url-status=live }}</ref>

In classical mechanics, accurate [[measurement]]s and [[prediction]]s of the state of objects can be calculated, such as [[Absolute location|location]] and [[velocity]]. In quantum mechanics, due to the [[uncertainty principle|Heisenberg uncertainty principle]], the complete state of a subatomic particle, such as its location and velocity, cannot be simultaneously determined.<ref>{{Cite web |title=Understanding the Heisenberg Uncertainty Principle |url=https://www.thoughtco.com/the-heisenberg-uncertainty-principle-2699357 |access-date=2022-05-10 |website=ThoughtCo |language=en |archive-date=2022-05-10 |archive-url=https://web.archive.org/web/20220510035843/https://www.thoughtco.com/the-heisenberg-uncertainty-principle-2699357 |url-status=live }}</ref>

In addition to describing the motion of atomic level phenomena, quantum mechanics is useful in understanding some large-scale phenomena such as [[superfluidity]], [[superconductivity]], and [[biological system]]s, including the function of [[Olfactory receptor|smell receptors]] and the [[protein structure|structures of protein]].<ref>{{cite web|url=https://www.discovermagazine.com/the-sciences/how-quantum-mechanics-lets-us-see-smell-and-touch| title=How Quantum Mechanics Lets Us See, Smell and Touch: How the science of the super small affects our everyday lives| work=Discovery Magazine| date=October 23, 2018| last=Folger| first=Tim| access-date=October 24, 2021| archive-url=https://web.archive.org/web/20210126120506/https://www.discovermagazine.com/the-sciences/how-quantum-mechanics-lets-us-see-smell-and-touch| archive-date=January 26, 2021}}</ref>