physical constants
Nature's fixed numbers
Physical constants are fundamental quantities in nature that remain fixed and unchanging—values like the speed of light, gravitational constant, or Planck's constant.
They appear throughout physics equations and define the basic parameters of the universe: The physical constants determine how atoms behave and stars burn.
Scientists measure them with extreme precision because even tiny uncertainties propagate through calculations.
Maximum possible velocity
- Avogadro's numberEntities in one mole
- atomic mass unitUnit for particle weight
Remaining always constant
- universalAffecting all equally
- dimensionlessWithout measurement units
- immutableIncapable of being changed
- fixedRestored or immovable
unchanging · fundamental · exact · defined · measured · finite · nonzero · anthropic
Science of precise quantification
- calibrationAdjusting for measurement accuracy
- precisionAccuracy of measurement
- accuracyDegree of correctness
- SI unitsInternational system of measurement
uncertainty · standardization · dimensionless · significant figures · spectroscopy
speed of light
Maximum possible velocity
- Avogadro's numberEntities in one mole
- atomic mass unitUnit for particle weight
invariant
Remaining always constant
- universalAffecting all equally
- dimensionlessWithout measurement units
- immutableIncapable of being changed
fixed · unchanging · fundamental · exact · defined · measured · finite · nonzero · anthropic · fine-tuned
metrology
Science of precise quantification
- calibrationAdjusting for measurement accuracy
- precisionAccuracy of measurement
- accuracyDegree of correctness
SI units · uncertainty · standardization · dimensionless · significant figures · spectroscopy
Schwarzschild radius
Black hole's critical boundary distance
physical constantsvariables
Changeable elements in equations
dependent variables · independent variables · random variables · parameters · unknowns
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