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Si-units
New post in Si-units
The value of one atomic mass unit
August 17th, 2022
mass
si-units
metrology
measurements
homework-and-exercises
Speed of light definition
January 31st, 2020
speed-of-light
metrology
unit-conversion
si-units
Spectral radiance unit conversion
January 15th, 2020
si-units
electromagnetic-radiation
spectroscopy
What is the unit for work done?
June 9th, 2020
work
units
dimensional-analysis
si-units
Why there is no "Edison" unit in physics?
April 9th, 2020
si-units
units
history
soft-question
electricity
Whats the range of dimension exponents in the SI system of units?
August 1st, 2022
si-units
units
Why are electrical units (specifically, electrical current) considered a base unit?
August 3rd, 2020
charge
electric-current
units
si-units
metrology
Why isn't a meter defined from a kilogram of water?
August 8th, 2020
si-units
length
mass
water
metrology
Where does the joules come from (ideal gas constant)?
August 1st, 2022
homework-and-exercises
thermodynamics
ideal-gas
si-units
unit-conversion
Does speed of light being constant make time a derived unit?
August 1st, 2022
spacetime
si-units
metrology
speed-of-light
special-relativity
How is the constant of the Biot-Savart Law derived?
August 4th, 2020
electromagnetism
si-units
magnetic-fields
conventions
What is "A" in AGeV?
August 1st, 2022
heavy-ion
si-units
terminology
particle-physics
energy
Is there a quantity measured in kilogram seconds?
October 14th, 2021
units
si-units
Why is the second the SI base unit for time?
August 1st, 2022
time
history
si-units
metrology
Intuitive meaning of Newton (units)
November 16th, 2020
si-units
newtonian-mechanics
Is anything actually 1 meter long (or 1kg of weight)?
August 1st, 2022
si-units
units
metrology
Why do we still not have an exact (constants-based) definition for a kilogram?
August 11th, 2020
conventions
mass
definition
si-units
metrology
The significance of kelvin as a unit of absolute temperature
June 11th, 2020
thermodynamics
temperature
units
si-units
What's keeping us from simply redefining Avogadro's Number / the Mole as a definite integer?
September 28th, 2020
physical-constants
si-units
metrology
Why is the length of the Kelvin unit of temperature equal to that of the Celsius unit?
June 10th, 2020
thermodynamics
si-units
units
definition
temperature
Why was the Planck constant $h$ fixed to be exactly $6.62607015\times10^{−34}\text{Js}$ and not some other value?
December 8th, 2020
si-units
physical-constants
metrology
Proper reference for the International System of Units
April 23rd, 2020
units
si-units
metrology
resource-recommendations
What's exactly the new definition of kilogram, second and meter?
September 28th, 2020
si-units
physical-constants
metrology
measurements
What technology is needed for an individual to reproduce the current SI meter and kilogram from scratch?
April 4th, 2022
si-units
mass
history
metrology
experimental-physics
What is a base unit in the new SI, and why is the ampere one of them?
April 19th, 2020
metrology
units
conventions
si-units
Is the fact that 100 kPa equals about 1 atmosphere accidental?
September 1st, 2020
metrology
pressure
si-units
Physical dimensions for the Coulomb force in SI and CGS
August 5th, 2020
si-units
faq
coulombs-law
electrostatics
unit-conversion
Is $\pi^2 \approx g$ a coincidence?
August 1st, 2022
dimensional-analysis
history
si-units
approximations
physical-constants
Why is the ampere a base unit and not the coulomb?
November 10th, 2020
electric-current
si-units
metrology
charge
Why is energy not an SI base unit?
August 1st, 2022
energy
si-units
metrology
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