The atoms themselves may not be classified as "in motion" but the constituent particles of atoms are (protons, neutrons, electrons), and molecules having greater than zero energyare also in motion.
During diffusion, the random motion of atoms causes them to spread out gradually.
According to the kinetic theory of gases a gas consists of a large number of atoms or molecules. These are in a constant random motion and collide with one another as well as the walls of the container.
The meaning is that atoms and molecules are permanently in motion.
Atoms are always in motion, even at very low temperatures. This motion is due to the thermal energy possessed by atoms. However, at absolute zero temperature (-273.15°C or 0 Kelvin), the atoms would theoretically have no motion as their thermal energy would be reduced to the minimum. However, achieving absolute zero temperatures is practically impossible.
Please be more specific. Small respect to what? Are you talking about the motion of atoms or the motion of sub atomic particles?
Since that's what heat is (the motion of atoms), how better to transfer than by random collisions? yes.
It isn't. It only looks continuous (sometimes), because the individual pieces (the atoms) are much smaller than anything we can see.
Atoms, molecules and ions are tiny particles that made up matter. Because of the continuous motion of these particles, either bumping into each other or vibrating back and forth, heat is created.
Democritus - Greek philosopher who believed in the 'marble' atomic model.John Dalton - Came up with the first atomic theory, in which he also believed atoms were indivisible.
If there is no extrnal source of energy, then in atom there is random motion ; no specific direction.
energy of an object due to the random motion of its atoms and molecules
Thermal energy
Atoms and molecules.
The particles move because of the Kinetic Theory. Matter is composed of particles that are atoms, molecules, or irons that always are in random motion.(Honestly you don't need to copy the hole matter is composed.... thing but just in case you might need it.)
During diffusion, the random motion of atoms causes them to spread out gradually.
According to the kinetic theory of gases a gas consists of a large number of atoms or molecules. These are in a constant random motion and collide with one another as well as the walls of the container.
Matter is made up of atoms, although atoms are made up of even smaller subatomic particles. Molecules are made up of a combination of atoms.