There are no forces of attraction between the particles.
The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely from each other. In most cases, there are essentially no attractive forces between particles. This means that gas has nothing to hold a specific shape or volume.
In the physical sciences, a particle (or corpuscle in older texts) is a small localized object to which can be ascribed several physical or chemical properties, such as volume, density, or mass. They vary greatly in size or quantity, from subatomic particles like the electron to microscopic particles like atoms and molecules, to microscopic particles like powders and other granular materials. Particles can also be used to create scientific models of even larger objects depending on their density, such as humans moving in a crowd or celestial bodies in motion.
The term particle is rather general in meaning and is refined as needed by various scientific fields. Anything that is composed of particles may be referred to as particulate. However, the noun particulate is most frequently used to refer to pollutants in the Earth's atmosphere, which are a suspension of unconnected particles, rather than a connected particle aggregation.
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