Spontaneous potential

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• Spontaneous potential — In the field of formation evaluation, spontaneous potential (SP) is a naturally occurring electric potential difference in the Earth, measured by an electrode in a borehole relative to a fixed reference electrode on the surface. SP was first… …   Wikipedia

• spontaneous potential —    See self potential …   Lexicon of Cave and Karst Terminology

• Spontaneous potential logging — The spontaneous potential log, commonly called the self potential log or SP log, is a measurement taken by oil industry well loggers to characterise rock formation properties. The log works by measuring small electric potentials (measured in… …   Wikipedia

• Spontaneous symmetry breaking — Quantum field theory (Feynman diagram) …   Wikipedia

• Spontaneous combustion, or self-heating, of coal —   A naturally occurring process caused by the oxidation of coal. It is most common in low rank coals and is a potential problem in storing and transporting coal for extended periods. Factors involved in spontaneous combustion include the size of… …   Energy terms

• Cardiac action potential — The cardiac action potential is a specialized action potential in the heart, with unique properties necessary for function of the electrical conduction system of the heart.The cardiac action potential differs significantly in different portions… …   Wikipedia

• Standard electrode potential — In electrochemistry, the standard electrode potential, abbreviated Eo, E0, or EO (with a superscript plimsoll character, pronounced nought), is the measure of individual potential of a reversible electrode (at equilibrium) at standard state,… …   Wikipedia

• Membrane potential — Differences in concentration of ions on opposite sides of a cellular membrane lead to a voltage called the membrane potential. Many ions have a concentration gradient across the membrane, including potassium (K+), which is at a high inside and a… …   Wikipedia

• Evoked potential — Intervention MeSH D005071 An evoked potential (or evoked response ) is an electrical potential recorded from the nervous system of a human or other animal following presentation of a …   Wikipedia

• End-plate potential — Miniature end plate potentials and end plate spikes recorded from muscle fiber End plate potentials (EPPs) (sometimes called end plate spikes ) are the depolarizations of skeletal muscle fibers caused by neurotransmitters binding to the… …   Wikipedia

• Reduction potential — (also known as redox potential, oxidation / reduction potential, ORP or Eh) is a measure of the tendency of a chemical species to acquire electrons and thereby be reduced. Reduction potential is measured in volts (V), or millivolts (mV). Each… …   Wikipedia