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Mean inter-particle distance (or mean inter-particle separation) is the mean distance between microscopic particles (usually atoms or molecules) in a macroscopic body.
In physics, mean free path is the average distance over which a moving particle (such as an atom, a molecule, or a photon) travels before substantially changing its direction or energy (or, in a specific context, other properties), typically as a result of one or more successive collisions with other particles.
Nuclear interaction length is the mean distance travelled by a hadronic particle before undergoing an inelastic nuclear interaction. ... Particle Data Group site
In particle physics, the radiation length is a characteristic of a material, related to the energy loss of high energy particles electromagnetically interacting with it. It is defined as the mean length (in cm) into the material at which the energy of an electron is reduced by the factor 1/e. [1]
Temperature is a statistical quantity whose formal definition is = (),, or the change in internal energy with respect to entropy, holding volume and particle number constant. A practical definition comes from the fact that the atoms, molecules, or whatever particles in a system have an average kinetic energy.
distance: meter (m) direction: unitless impact parameter meter (m) differential (e.g. ) varied depending on context differential vector element of surface area A, with infinitesimally small magnitude and direction normal to surface S: square meter (m 2)
In particle physics, every type of particle has an associated antiparticle with the same mass but with opposite physical charges such as electric charge. For example, the antiparticle of the electron is the antielectron (which is often referred to as the positron).
In physics, the thermal de Broglie wavelength (, sometimes also denoted by ) is a measure of the uncertainty in location of a particle of thermodynamic average momentum in an ideal gas. [1] It is roughly the average de Broglie wavelength of particles in an ideal gas at the specified temperature.