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Density gradient is a spatial variation in density over an area. It is used in various fields of science, such as aerodynamics, water, biology, geophysics and urban economics.
Learn about the natural separation of ocean water into horizontal layers by density, and how climate change affects it. Find out how to quantify and measure stratification using temperature, salinity, and buoyancy frequency.
Density is the mass per unit volume of a substance, and it varies with temperature and pressure. Learn about the SI and other units of density, the history of its discovery and calculation, and the density of common substances.
Population density is the number of people per unit of land area, usually per square kilometre or square mile. Learn about the factors, effects and examples of population density, and compare the most densely populated countries and territories in the world.
Earth mass is a unit of mass equal to the mass of the planet Earth, which is about 5.9722 × 1024 kg. The web page explains how the Earth mass is measured indirectly by determining Earth's density, gravity, or gravitational constant, and what elements make up the Earth's core, mantle and crust.
Learn about the layers of Earth, from the crust and lithosphere to the core and mantle, and their chemical and mechanical properties. Find out how scientists use various methods to study the internal structure of Earth, such as seismology, gravimetry, and geochemistry.
This glossary of geography terms is a list of definitions of terms and concepts used in geography and related fields, including Earth science, oceanography, cartography, and human geography, as well as those describing spatial dimension, topographical features, natural resources, and the collection, analysis, and visualization of geographic data.
The Adams–Williamson equation, named after Leason H. Adams and E. D. Williamson, is an equation used to determine density as a function of radius, more commonly used to determine the relation between the velocities of seismic waves and the density of the Earth's interior. [1]
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