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Metrology
New post in Metrology
The value of one atomic mass unit
August 17th, 2022
homework-and-exercises
metrology
si-units
measurements
mass
Speed of light definition
January 31st, 2020
unit-conversion
si-units
metrology
speed-of-light
Why are electrical units (specifically, electrical current) considered a base unit?
August 3rd, 2020
si-units
metrology
electric-current
charge
units
Definition of a year
August 1st, 2022
metrology
definition
terminology
time
Why isn't a meter defined from a kilogram of water?
August 8th, 2020
metrology
mass
water
si-units
length
Does speed of light being constant make time a derived unit?
August 1st, 2022
speed-of-light
si-units
metrology
special-relativity
spacetime
Why is the second the SI base unit for time?
August 1st, 2022
history
time
si-units
metrology
Is the speed of light in vacuum always the same value?
August 1st, 2022
metrology
physical-constants
speed-of-light
special-relativity
Can the accuracy in Planck's constant ever be increased?
August 1st, 2022
metrology
physical-constants
error-analysis
$\rm Lux$ and $W/m^2$ relationship?
October 23rd, 2021
metrology
power
visible-light
units
Which is the "roundest man-made object": Gravity probe B rotor or the Avogadro project sphere?
August 9th, 2022
metrology
technology
soft-question
Is anything actually 1 meter long (or 1kg of weight)?
August 1st, 2022
si-units
metrology
units
Why do we still not have an exact (constants-based) definition for a kilogram?
August 11th, 2020
conventions
mass
definition
metrology
si-units
Measuring the speed of light and defining the metre - absolute or relative?
March 13th, 2022
metrology
experimental-physics
measurements
speed-of-light
spacetime
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 standard uncertainty defined with a level of confidence of only 68%?
December 22nd, 2020
conventions
statistics
error-analysis
metrology
How is a second measured? And why is it measured that way?
October 4th, 2021
metrology
measurements
time
Why was the Planck constant $h$ fixed to be exactly $6.62607015\times10^{−34}\text{Js}$ and not some other value?
December 8th, 2020
physical-constants
metrology
si-units
Proper reference for the International System of Units
April 23rd, 2020
metrology
si-units
units
resource-recommendations
What's exactly the new definition of kilogram, second and meter?
September 28th, 2020
metrology
measurements
physical-constants
si-units
273 + degree Celsius = Kelvin. Why 273?
March 10th, 2021
temperature
metrology
definition
units
water
Why is the absolute zero a rational number in Celcius?
September 11th, 2020
definition
units
temperature
water
metrology
Refractive Index of Air Depending on Temperature
November 12th, 2020
metrology
optics
temperature
thermodynamics
refraction
How many fixed points does a Kelvin scale have?
December 21st, 2020
thermodynamics
metrology
temperature
What technology is needed for an individual to reproduce the current SI meter and kilogram from scratch?
April 4th, 2022
mass
si-units
metrology
experimental-physics
history
What is a base unit in the new SI, and why is the ampere one of them?
April 19th, 2020
units
conventions
si-units
metrology
The famous drop of $c$
March 18th, 2020
speed-of-light
history
physical-constants
metrology
Is the fact that 100 kPa equals about 1 atmosphere accidental?
September 1st, 2020
pressure
metrology
si-units
Why is energy not an SI base unit?
August 1st, 2022
energy
metrology
si-units
Why is the ampere a base unit and not the coulomb?
November 10th, 2020
electric-current
charge
si-units
metrology
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