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Sometimes you report a change as an absolute change, such as the Dow Jones dropping by 44.05 points. Other times you report a percentage change, such as the Dow Jones dropping by 0.26 percent. The percentage change shows how big…
In the steel industry, the term “HSS” stands for hollow structural sections. According to Halin Pipe Corporation, HSS is a type of metal profile with a hollow tubular cross-section. Most HSS are of circular or rectangular sections. However, other shapes…
Like most biomes on Earth, the savanna ecosystem survives on a delicate balance among environmental factors and various species, including humans. Severe drought can rob these grasslands of their life-giving water and foliage, while poachers and indigenous peoples often threaten…
Interval notation is a simplified form of writing the solution to an inequality or system of inequalities, using the bracket and parenthesis symbols in lieu of the inequality symbols. Intervals with parentheses are called open intervals, meaning the variable cannot…
Since ancient times, windmills have been used, primarily as a method of grinding grain into flour by using the power of the wind. The original windmills, used in Persia in the 9th century, were vertical-axis mills, but modern windmills use…
The proportion of something is the number of observations that meet a certain criterion, divided by the total number of observations. For example, the proportion of males in the population of Americans is the number of American males divided by…
Acids are molecules that release hydrogen ions or protons in a solution. They are generally sour and can dissolve metals. Bases are also molecules that are bitter in taste and have opaque coloring. Acids and bases are either strong or…
Not many topographic features so fulfill that clichéd adjective “breathtaking” as a massive canyon. Ranking the greatest defiles on the planet, though, isn’t easy. Even geologists may disagree on what constitutes a true river gorge versus, say, simply a drainage…
Amphibian means “double life.” These amazing creatures are at home both on land and underwater. In fact, all amphibians begin life underwater as tiny tadpoles with tails and gills. As they mature, gills are replaced by lungs, and the tail…
Some examples of common demographics include age, gender, income level, occupation and so on. These labels are used to describe the socioeconomic characteristics of any given population, and they’re usually expressed as a percentage. That allows you to compare each…
