massless
Having no weight
Massless describes something having no mass.
In physics, massless particles like photons travel at the speed of light and behave differently from matter with mass.
The term appears in theoretical discussions: a massless spring, massless rope—idealized objects in physics problems where mass is ignored to simplify calculations.
Electromagnetic radiation unit
- gluonStrong force mediator
- neutrinoUncharged, near-massless particle
- gravitonHypothetical gravity-carrying particle
- W bosonCharged weak force carrier
boson · fermion · antiparticle · lepton · virtual particle · particle physics · field theory · symmetry
Having no heft
- incorporealNot made of matter
- insubstantialLacking physical or material substance
- intangibleNot physically present
- immaterialLacking physical form; unimportant
gossamer · airy · ethereal · ghostly · spectral · phantasmal · evanescent · transcendent
Maximum possible velocity
- special relativityTheory uniting space, time
- EinsteinByword for genius
- invarianceQuality of staying unchanged
- spacetimeMerged dimensional framework
E=mc² · time dilation · reference frame · velocity · momentum · inertial · causality
Physics at nanoscopic scales
- wavefunctionQuantum state's mathematical representation
- superpositionCoexisting in multiple states
- uncertainty principleConjugate variables resist simultaneous precision
- Planck's constantQuantum action unit
quantization · entanglement · propagator · spin · chirality · polarization
photon
Electromagnetic radiation unit
- gluonStrong force mediator
- neutrinoUncharged, near-massless particle
- gravitonHypothetical gravity-carrying particle
W boson · boson · fermion · antiparticle · lepton · virtual particle · particle physics · field theory · symmetry · interaction
weightless
Having no heft
- incorporealNot made of matter
- insubstantialLacking physical or material substance
- intangibleNot physically present
immaterial · gossamer · airy · ethereal · ghostly · spectral · phantasmal · evanescent · transcendent · unsubstantial
light speed
Maximum possible velocity
- special relativityTheory uniting space, time
- EinsteinByword for genius
- invarianceQuality of staying unchanged
spacetime · E=mc² · time dilation · reference frame · velocity · momentum · inertial · causality
quantum mechanics
Physics at nanoscopic scales
- wavefunctionQuantum state's mathematical representation
- superpositionCoexisting in multiple states
- uncertainty principleConjugate variables resist simultaneous precision
Planck's constant · quantization · entanglement · propagator · spin · chirality · polarization