How can something (ie. light) have volume and energy, but no mass?

Question

I’ve watched multiple YouTube videos and read a couple things online and now I have a headache. It still doesn’t make sense to me.
If photons have volume, then there can only be a finite number of photons in a given space, right? And once that limit is reached, why can’t I squeeze in one more photon? What is stopping me, the “walls” or “shell” of the photons? What are the walls/shells made of?

Every source I’ve looked at agrees that light is BOTH a wave AND a particle. I can understand why waves don’t have mass, but then what the hell is a “particle”? Every other elementary particle like quarks have mass, right?

In: 27

Answer 1

> If photons have volume, then there can only be a finite number of photons in a given space, right?

Photons don’t seem to touch each other, that is to say they seem to lack the property of touch with respect to each other. Take two water hoses and point them at each other and they will bounce and splash. Take two laser pointers and cross the beams and nothing happens.

> BOTH a wave AND a particle

Actually they BEHAVE like a wave and particle, photons aren’t a wave and particle.