Spin (physics) discrete angular momenta despite having no orbital angular momentum. In some ways, spin is like a vector quantity; it has a definite magnitude, and it has a "direction" (but quantization makes this "direction" different from the direction of an ordinary vector). All elementary particles of a given kind have the same magnitude of spin angular momentum, which is indicated by assigning the particle a spin quantum number. The SI unit of spin is the (N·m·s) or (kg·m·s), just as with classical angular momentum. In practice, spin is given as a dimensionless spin quantum number by dividing the spin angular momentum
Earthquake duration magnitude in 2001 in the Bhuj area of northwestern India, the latest "empirically" derived equations for Md determinations are published: formula_1 ( Castello et al., 2007) formula_2 ( Mandal et al., 2004) Although conversions between empirically derived "sensitive" seismic parameters such as earthquake magnitude scales is mathematically cautioned as well as physically limited, some seismologists such as Brumbaugh have nevertheless attempted to produce a relationship linking ML to Md for a rather small sample of 17 events in Arizona: formula_3 Earthquake duration magnitude The concept of Earthquake Duration Magnitude - originally proposed by Bisztricsany in 1958 using surface waves only -