In what state of matter are particles most closely packed?

Particles are most closely packed in the solid state of matter due to the strong intermolecular forces that hold them tightly together in a fixed arrangement. This close packing results in a definite shape and volume for solids. In solids, the particles vibrate but do not move freely, which allows them to maintain their structure. This characteristic stands in contrast to liquids, where particles are close but not fixed, allowing for fluidity. In gases, particles are far apart and move freely, filling the volume of their container. The aqueous state refers to a liquid state where substances are dissolved in water, which shares properties with liquids. Therefore, solids demonstrate the highest degree of particle packing compared to the other states of matter.