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**Population density**(in agriculture: standing stock or plant**density**) is a measurement of**population**per unit land area. It is mostly applied to humans, but sometimes to other living organisms too. It is a key geographical term. [1] In**simple**terms,**population density**refers to the number of people living in an area per square kilometre or other ...Statistics is a mathematical body of

**science**that pertains to the collection, analysis, interpretation or explanation, and presentation of data, [9] or as a branch of**mathematics**. [10] Some consider statistics to be a distinct mathematical**science**rather than a branch of**mathematics**. While many scientific investigations make use of data ...**Population**balance equations (PBEs) have been introduced in several branches of modern**science**, mainly in Chemical Engineering, [1] to describe the evolution of a**population**of particles. This includes topics like crystallization, [2] leaching (metallurgy), [3] [4] liquid–liquid extraction, gas-liquid dispersions like water electrolysis, [5 ...The Lotka–Volterra equations, also known as the Lotka–Volterra predator–prey model, are a pair of first-order nonlinear differential equations, frequently used to describe the dynamics of biological systems in which two species interact, one as a predator and the other as prey. The

**populations**change through time according to the pair of ...**Population**dynamics is the type of**mathematics**used to model and study the size and age composition of populations as dynamical systems. History [ edit ]**Population**dynamics has traditionally been the dominant branch of mathematical biology , which has a history of more than 220 years, [1] although over the last century the scope of ...Number

**density**. The number**density**(symbol: n or ρN) is an intensive quantity used to describe the degree of concentration of countable objects ( particles, molecules, phonons, cells, galaxies, etc.) in physical space: three-dimensional volumetric number**density**, two-dimensional areal number**density**, or one-dimensional linear number**density**.