Air quality therefore measures the density of air pollutants, such as smoke and emissions. Air quality is defined by the number of pollutants in a certain area. This can apply to gases, liquids, and solids. Density can refer to the number of molecules in a substance. A habitat can only support a limited number of each type of organism, so an overpopulation of deer can drive those deer to other habitats, including human habitats such as towns. Vegetation does not have time to develop, so food becomes scarce. As a result of the deer’s dense population, the competition for land and food is heightened and many deer die of starvation. A common reason is a lower density of their natural predators, such as pumas or bears. Deer have overpopulated areas of the Midwestern United States, for example. Sometimes, animal or plant populations are too dense. Density can also be used to refer to the number of plants or animals in a certain area. Cities have a greater population density than rural areas. Of course, not all the people in the country are spread out evenly. It has a population of 4,839,400 and an area of 687 square kilometers (265 square miles), so its density is 7,044 people per square kilometer (18,262 per square mile). The country of Singapore is one of the most densely populated countries in the world. The population density of a country is the number of people in that country divided by the area in square kilometers or miles. To calculate density, you divide the number of objects by the measurement of the area. Density is the number of things-which could be people, animals, plants, or objects-in a certain area.
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