**Science / Chemistry / Arrhenius Equation:** In 1889, Svante Arrhenius explained the variation of rate constants with temperature for several elementary reactions using the relationship, k = A exp(-Ea/RT), where the rate constant k is the total frequency of collisions between reaction molecules A times the fraction of collisions exp(-Ea/RT) that have an energy that exceeds a threshold activation energy Ea at a temperature of T (in kelvins). R is the universal gas constant.

Business / Finance / Regression Equation: An equation that describes the average relationship between a dependent variable and a set of explanatory variables. MORE

Technology / Radar / Radar Range Equation (RRE): The radar range equation (rre) relates the range performance of a radar system to other radar components and their characteristics. MORE

Science / Chemistry / Net Ionic Equation: A net ionic equation is an ionic equation with all DEFINE[spectator ions'>spectator ions eliminated. For example, Ag+(aq) + NO3-(aq) + Na+(aq) + Cl-(aq) = agcl(s) + Na+(aq) + NO3-(aq) is an ionic equa MORE