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Order-of-magnitude
New post in Order-of-magnitude
About how fast can a small fish swim before experiencing turbulent flow around its body?
July 21st, 2022
fluid-dynamics
turbulence
order-of-magnitude
What's the greatest range of orders of magnitude?
August 1st, 2022
order-of-magnitude
A Fermi-question: Are there more stars than grains of sand?
August 1st, 2022
order-of-magnitude
universe
Planck mass is about the mass of one eyebrow hair
August 1st, 2022
mass
scales
order-of-magnitude
physical-constants
How did Enrico Fermi calculate the classical Fermi Problem?
April 15th, 2020
order-of-magnitude
air
nuclear-physics
How does the temperature of the triple point of water depend on gravitational acceleration?
August 1st, 2022
thermodynamics
order-of-magnitude
How can we make an order-of-magnitude estimate of the strength of Earth's magnetic field?
July 21st, 2020
estimation
electromagnetism
magnetohydrodynamics
order-of-magnitude
forces
Why is the string length around the Planck length?
March 23rd, 2022
scales
string-theory
order-of-magnitude
physical-constants
dimensional-analysis
Why do mirages only appear on hot days?
June 16th, 2021
estimation
optics
everyday-life
refraction
order-of-magnitude
Are neurons more energy efficient than transistors?
October 21st, 2021
efficient-energy-use
semiconductor-physics
electronics
biophysics
order-of-magnitude
Comparing the strength of gravity and electricity
October 2nd, 2020
physical-constants
dimensional-analysis
coulombs-law
order-of-magnitude
newtonian-gravity
In dimensional analysis, why the dimensionless constant is usually of order 1?
September 17th, 2020
fine-tuning
order-of-magnitude
dimensional-analysis
How is it possible that the energy needed to stop a train is the same as the (chemical) energy in a pack of chocolate cookies?
August 29th, 2020
physical-chemistry
order-of-magnitude
energy
everyday-life
estimation
Is there a rigorous definition of 'much greater than'?
August 1st, 2022
terminology
approximations
order-of-magnitude
notation
Turned to steel in the great magnetic field
August 1st, 2022
neutron-stars
atoms
solid-state-physics
order-of-magnitude
nuclear-physics
Can the solar system really fit in a thimble?
July 22nd, 2020
atoms
nuclear-physics
order-of-magnitude
solar-system
If an apple is magnified to the size of the earth, then the atoms in the apple are approximately the size of the original apple
March 21st, 2021
estimation
textbook-erratum
order-of-magnitude
atomic-physics
atoms
Explanation of energy levels in molecules, atoms, nuclei and their relationship
August 1st, 2022
scales
energy
nuclear-physics
atomic-physics
order-of-magnitude
What's smaller: a neutrino, or a string from string theory
July 25th, 2020
neutrinos
order-of-magnitude
particle-physics
string-theory
Can we really neglect gravitational strength?
August 1st, 2022
standard-model
estimation
order-of-magnitude
physical-constants
gravity
Measuring the nearest order of magnitude
August 1st, 2022
geometry
order-of-magnitude
homework-and-exercises
What is a "scale length", and how do I calculate it for galaxies?
August 1st, 2022
order-of-magnitude
astrophysics
estimation
galaxies
scales
Newton's Third Law Of Motion: Earth Falling to an Apple?
August 1st, 2022
newtonian-gravity
newtonian-mechanics
order-of-magnitude
Temperature on the surface of the sun calculated with the Stefan-Boltzmann-rule
December 23rd, 2021
astrophysics
estimation
order-of-magnitude
blackbody
temperature
How many photons enter our eyes per second when looking at the blue sky on a sunny day?
August 1st, 2022
order-of-magnitude
visible-light
estimation
vision
Why don't the relative positions of stars and other objects in a galaxy change over the year?
August 2nd, 2020
order-of-magnitude
parallax
astronomy
estimation
How cold does it need to be for spit to freeze before hitting the ground?
August 1st, 2022
thermodynamics
order-of-magnitude
phase-transition
water
Why is 7 TeV considered as a big amount of energy?
August 1st, 2022
large-hadron-collider
kinematics
energy
particle-physics
order-of-magnitude
Is there scale by size of all discovered particles?
July 26th, 2022
scales
elementary-particles
order-of-magnitude