This is the definition of a molecule.
By definition a massless particle has no rest mass therefore it can not take up any spacial volume. I think the confusion lies with calling something that is massless, a particle. This is because as soon as we hear particle we think "object" and objects have definite mass and volume. A photon is massless and sometimes people may refer to it as a particle of light. But in fact that is sort of a misnomer being that it really isn't a particle, though it has particle-like properties. If something is massless theorists have said that the object does not interact with the Higgs field, though gravitational effects are still felt by the photon, example: gravitational lensing.
Particle density refers to the number of particles present in a given volume of space. It is a measure of how closely packed particles are within a material or substance. Particle density is usually expressed in terms of particles per unit volume.
A particle arrangement refers to how individual particles are organized in a given space. This could include their position, orientation, and spacing relative to one another. Particle arrangements can vary widely depending on the type of particles and the conditions they are in.
An adjacent time zone is one that is next to or neighboring another time zone. This means that the time in the adjacent time zone is typically one hour ahead or behind the time in the neighboring time zone.
the word adjacent means next to
Adjacent
To be next to, alongside, or nearby something else. Such as--> My chair is adjacent to my desk.
Next to or adjoining something else.
No, because by definition, vertical angles are not adjacent angles. Hope this helps
The smallest particle of matter having distinctive chemical and physiacl properties; a tiny particle
A pair of angels in a straight line formed by a line or half-line meeting it is called adjacent angels. Adjacent angels will add up to 180°.
Adjacent means that it is next to something. So, if you two intersecting lines, the angles that are right next to each other or that share a line are called "adjacent"
This is the definition for adjacent angles in geometry. Adjacent angles cannot overlap one another. Adjacent angles also have a common vertex.
Discrimination
Particle that are too big (for the technology that you are working with).
Conduction is the process that transfers thermal energy through matter directly from particle to particle. This is typically facilitated by collisions between adjacent particles in a solid material, which allows the transfer of kinetic energy.