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Top Questions
21
votes
Why does water ($\mathrm{H_2O}$) only have two distinct fluid phases?
condensed-matter
water
phase-transition
states-of-matter
liquid-state
asked Nov 28 '13 at 0:47
physics.stackexchange.com
6
votes
Is Galilei's reasoning on free fall valid?
newtonian-mechanics
experimental-physics
newtonian-gravity
history
free-fall
asked Jan 8 '14 at 13:47
physics.stackexchange.com
Top Answers
109
What exactly is a photon?
physics.stackexchange.com
50
Is throwing dice a stochastic or a deterministic process?
physics.stackexchange.com
35
How can momentum but not energy be conserved in an inelastic collision?
physics.stackexchange.com
18
Second law of Newton for variable mass systems
physics.stackexchange.com
16
Why do non-rigid bodies try to increase their moment of inertia?
physics.stackexchange.com
15
Why does carbon dioxide not sink in air if other dense gases do?
physics.stackexchange.com
13
Why do electrons and positrons exhibit opposite helical motion in a magnetic field?
physics.stackexchange.com
13
What is the proper way to explain the twin paradox?
physics.stackexchange.com
12
Why do EM waves propagate forward in time rather than backward in time?
physics.stackexchange.com
11
Entropy as a function of temperature: is temperature well defined?
physics.stackexchange.com
11
How to rebut denials of the existence of photons?
physics.stackexchange.com
11
Connection between Hamiltonian version of the least action principle and probability amplitude in the Schrödinger equation
physics.stackexchange.com
10
Is the Dirac $\delta$-function necessarily symmetric?
physics.stackexchange.com
10
Does Newton's third law of motion fail anywhere?
physics.stackexchange.com
10
Why is spacetime not Riemannian?
physics.stackexchange.com
10
Propagator in Quantum Mechanics
physics.stackexchange.com
9
Is any work done if I walk in a circle?
physics.stackexchange.com
9
Why does a copper mug keep my Moscow Mule cold? (Or does it?)
physics.stackexchange.com
9
Why are there two metric signature conventions?
physics.stackexchange.com
9
What is the resolution to Gibb's paradox?
physics.stackexchange.com
8
Recommended books for advanced undergraduate electrodynamics
physics.stackexchange.com
8
The energy stored in the electromagnetic field of an electron
physics.stackexchange.com
7
Galilean transform as limit of Lorentz one
physics.stackexchange.com
7
Is charge point-like or a smear?
physics.stackexchange.com
7
How does the hydrogen atom know which frequencies it can emit photons at?
physics.stackexchange.com
7
Why do atoms tend towards electrical stability?
physics.stackexchange.com
7
How does the Schrödinger model of the hydrogen atom take into account radiation friction?
physics.stackexchange.com
7
Viscosity and surface tension
physics.stackexchange.com
7
How can space be cold? Its a vacuum?
physics.stackexchange.com
6
Does zero point energy really contribute to the cosmological constant?
physics.stackexchange.com
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