Respuesta :
An aspect of the kinetic-molecular theory and can be used to explain the behavior of plasmas is particle exchange energy through elastic collision.
What is elastic collision?
In physics, an elastic collision is an encounter (collision) between the two bodies in which the total kinetic energy of the two bodies remains the same. In an ideal, perfectly elastic collision, there is no net conversion of the kinetic energy into other forms such as heat, noise, or potential energy.
During collision of small objects, kinetic energy is first converted to potential energy associated with a repulsive or attractive force between the particles (when the particles move against this force, i.e. angle between the force and the relative velocity is obtuse), then this potential energy is converted back to kinetic energy (when the particles move with this force, i.e. angle between force and the relative velocity is acute).
Collisions of the atoms are elastic, for example Rutherford backscattering.
A useful special case of the elastic collision is when the two bodies have equal mass, in which case they will simply exchange their momenta.
The molecules—as distinct from atoms—of gas or liquid rarely experience perfectly elastic collisions because kinetic energy is exchanged between the molecules’ translational motion and their internal degrees of freedom with each collision. At any instant, half collisions are, to a varying extent, inelastic collisions (the pair possesses less kinetic energy in their translational motions after the collision than before), and half could be described as “super-elastic” (possessing the more kinetic energy after the collision than before). Averaged across the entire sample, the molecular collisions can be regarded as essentially elastic as long as Planck's law forbids energy from being carried away by black-body photons.
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