Quantum Quantum In physics, a quantum (plural: quanta) is the minimum amount of any physical entity (physical property) involved in an interaction. The fundamental notion that a physical property may be "quantized" is referred to as "the hypothesis of quantization". This means that the magnitude of the physical property can take on only discrete values consisting of integer multiples of one quantum. For example, a photon is a single quantum of light (or of any other form of electromagnetic radiation). Similarly, the energy of an electron bound within an atom is quantized and can exist only in certain discrete values. (Indeed,
Amount in controversy Amount in controversy Amount in controversy (sometimes called jurisdictional amount) is a term used in civil procedure to denote the amount at stake in a lawsuit, in particular in connection with a requirement that persons seeking to bring a lawsuit in a particular court must be suing for a certain minimum amount (or below a certain maximum amount) before that court may hear the case. In United States federal courts, the term currently applies only to cases brought under diversity jurisdiction, meaning that the court is able to hear the case only because it is between citizens of different states.