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
Negative and positive rights after a disaster. This consideration has led ethicists to agree in a general way that positive obligations are usually junior to negative obligations because they are not reliably "prima facie". Some critics of positive rights implicitly suggest that because positive obligations are not reliably "prima facie" they must always be agreed to through contract. Nineteenth-century philosopher Frédéric Bastiat summarized the conflict between these negative and positive rights by saying: According to Jan Narveson, the view of some that there is no distinction between negative and positive rights on the ground that negative rights require police and courts for their enforcement