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Question Number 171044 by sciencestudent last updated on 06/Jun/22
Is the Light a matter?
$${Is}\:{the}\:{Light}\:{a}\:{matter}? \\ $$
Commented by mr W last updated on 06/Jun/22
does it matter if it′s not a matter?
$${does}\:{it}\:{matter}\:{if}\:{it}'{s}\:{not}\:{a}\:{matter}? \\ $$
Commented by peter frank last updated on 07/Jun/22
matter is any thing that has mass  and accupied the space
$$\mathrm{matter}\:\mathrm{is}\:\mathrm{any}\:\mathrm{thing}\:\mathrm{that}\:\mathrm{has}\:\mathrm{mass} \\ $$$$\mathrm{and}\:\mathrm{accupied}\:\mathrm{the}\:\mathrm{space} \\ $$
Commented by wuzie last updated on 07/Jun/22
  matter is anything that has mass   and occupy space  light has tiny particles called  photons which conserves energy  according to E=MC^2   energy conservesible at an   electromagnetic speed spectrum  whuch photon has. to matter  which matter entails mass
$$ \\ $$$${matter}\:{is}\:{anything}\:{that}\:{has}\:{mass}\: \\ $$$${and}\:{occupy}\:{space} \\ $$$${light}\:{has}\:{tiny}\:{particles}\:{called} \\ $$$${photons}\:{which}\:{conserves}\:{energy} \\ $$$${according}\:{to}\:{E}={MC}^{\mathrm{2}} \\ $$$${energy}\:{conservesible}\:{at}\:{an}\: \\ $$$${electromagnetic}\:{speed}\:{spectrum} \\ $$$${whuch}\:{photon}\:{has}.\:{to}\:{matter} \\ $$$${which}\:{matter}\:{entails}\:{mass} \\ $$$$ \\ $$
Answered by aleks041103 last updated on 09/Jun/22
It depends on how you define matter.  By modern physics standarts, light is  comprised of photons − particles that  are excitations in the quantum bosonic  EM field. That is why we call light  bosonic matter. But here the word  ′matter′ is used for a lack of a better one.  Usually, by matter we mean something  that can occupy some volume of spacetime.  Bosonic matter doesn′t.  On the other hand, fermionic matter  does, since it obeys a Pauli exclusion  principle of sorts.  Therefore, if you define matter as   the quantity comprising anything,  then your question becomes trivial −   light is matter.  But if by matter you mean sth that   occupies some finite volume, then  matter and fermionic matter become  the same thing. Then, by this definition  light is not matter.
$${It}\:{depends}\:{on}\:{how}\:{you}\:{define}\:{matter}. \\ $$$${By}\:{modern}\:{physics}\:{standarts},\:{light}\:{is} \\ $$$${comprised}\:{of}\:{photons}\:−\:{particles}\:{that} \\ $$$${are}\:{excitations}\:{in}\:{the}\:{quantum}\:{bosonic} \\ $$$${EM}\:{field}.\:{That}\:{is}\:{why}\:{we}\:{call}\:{light} \\ $$$$\boldsymbol{{bosonic}}\:\boldsymbol{{matter}}.\:{But}\:{here}\:{the}\:{word} \\ $$$$'{matter}'\:{is}\:{used}\:{for}\:{a}\:{lack}\:{of}\:{a}\:{better}\:{one}. \\ $$$${Usually},\:{by}\:{matter}\:{we}\:{mean}\:{something} \\ $$$${that}\:{can}\:{occupy}\:{some}\:{volume}\:{of}\:{spacetime}. \\ $$$${Bosonic}\:{matter}\:{doesn}'{t}. \\ $$$${On}\:{the}\:{other}\:{hand},\:{fermionic}\:{matter} \\ $$$${does},\:{since}\:{it}\:{obeys}\:{a}\:{Pauli}\:{exclusion} \\ $$$${principle}\:{of}\:{sorts}. \\ $$$${Therefore},\:{if}\:{you}\:{define}\:{matter}\:{as}\: \\ $$$${the}\:{quantity}\:{comprising}\:{anything}, \\ $$$${then}\:{your}\:{question}\:{becomes}\:{trivial}\:−\: \\ $$$${light}\:{is}\:{matter}. \\ $$$${But}\:{if}\:{by}\:{matter}\:{you}\:{mean}\:{sth}\:{that}\: \\ $$$${occupies}\:{some}\:{finite}\:{volume},\:{then} \\ $$$${matter}\:{and}\:{fermionic}\:{matter}\:{become} \\ $$$${the}\:{same}\:{thing}.\:{Then},\:{by}\:{this}\:{definition} \\ $$$${light}\:{is}\:{not}\:{matter}. \\ $$

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