Solids
You would typically find this form of matter in the gaseous state, where the molecules have higher kinetic energy and move more rapidly compared to the molecules in solid or liquid states. Gas molecules have more freedom of movement and are not held tightly together like in solids or liquids.
The state of matter that is held tightly in place is in the form of a solid. Gas particles are not tightly packed, unless they are being pressurized, same with water.
Yes, anything that has a mass and occupies space is matter.
oranges
The past tense is held.
a solid
Yes, X-rays at not a form of matter. They are a form of electromagnetic energy.
Yes, X-rays at not a form of matter. They are a form of electromagnetic energy.
Solid state
slolid
Photon matter is a form of energy, not a physical substance.
Heat is not a form of matter: it is a form of energy. Of course, Einstein famously proved the equivalence of matter and energy.