Physics, Pixelated
Can Temperature Be Negative? Negative Absolute ...
Physicists have made systems with negative absolute temperature since 1951. They are not colder than absolute zero; they are hotter than any positive temperature. Here is why, what was measured,...
Can Temperature Be Negative? Negative Absolute ...
Physicists have made systems with negative absolute temperature since 1951. They are not colder than absolute zero; they are hotter than any positive temperature. Here is why, what was measured,...
Why Does a Magnet Fall Slowly Through a Copper ...
Copper isn’t magnetic, yet a strong magnet dropped down a copper pipe falls in slow motion. The reason is Lenz’s law: the currents the moving magnet induces always push back...
Why Does a Magnet Fall Slowly Through a Copper ...
Copper isn’t magnetic, yet a strong magnet dropped down a copper pipe falls in slow motion. The reason is Lenz’s law: the currents the moving magnet induces always push back...
What Is the Black Hole Information Paradox? Whe...
If black holes evaporate into featureless heat, what happens to everything that fell in? Here is Hawking’s paradox, the Page curve that turned it into a calculation, the recent “island”...
What Is the Black Hole Information Paradox? Whe...
If black holes evaporate into featureless heat, what happens to everything that fell in? Here is Hawking’s paradox, the Page curve that turned it into a calculation, the recent “island”...
Why Do Electrons Have Spin ½? What Spin Is, and...
Electrons carry an intrinsic angular momentum of ½ in units of ħ. It splits beams of atoms in two, makes electrons need two full turns to come back to themselves,...
Why Do Electrons Have Spin ½? What Spin Is, and...
Electrons carry an intrinsic angular momentum of ½ in units of ħ. It splits beams of atoms in two, makes electrons need two full turns to come back to themselves,...
What Exactly Is Entropy? Boltzmann’s S = k log ...
Entropy is not really “disorder.” It is a count of how many microscopic arrangements look the same from outside. Here is Clausius’s version, Boltzmann’s formula, and why the count almost...
What Exactly Is Entropy? Boltzmann’s S = k log ...
Entropy is not really “disorder.” It is a count of how many microscopic arrangements look the same from outside. Here is Clausius’s version, Boltzmann’s formula, and why the count almost...
How Does GPS Correct for Relativity? The 38 Mic...
Every GPS fix depends on Einstein. Satellite clocks gain roughly 38 microseconds a day relative to the ground, and the system is built to cancel it. Here is where the...
How Does GPS Correct for Relativity? The 38 Mic...
Every GPS fix depends on Einstein. Satellite clocks gain roughly 38 microseconds a day relative to the ground, and the system is built to cancel it. Here is where the...