Plasma (physics) potential in the space between charged particles, independent of how it can be measured, is called the "plasma potential", or the "space potential". If an electrode is inserted into a plasma, its potential will generally lie considerably below the plasma potential due to what is termed a Debye sheath. The good electrical conductivity of plasmas makes their electric fields very small. This results in the important concept of "quasineutrality", which says the density of negative charges is approximately equal to the density of positive charges over large volumes of the plasma (formula_6), but on the scale of the Debye length
Positive real numbers of the logarithmic scale. For purposes of international standards ISO 80000-3 the dimensionless quantities are referred to as levels. Positive real numbers In mathematics, the set of positive real numbers, formula_1, is the subset of those real numbers that are greater than zero. The non-negative real numbers, formula_2, also include zero. The symbols formula_3 and formula_4 are ambiguously used for either of these, so it safer to always specify which. In a complex plane, formula_5 is identified with the positive real axis and is usually drawn as a horizontal ray. This ray is used as reference in the polar form