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The specific gravity stands for a dimensionless unit that defines the ratio of density of a substance to the density of water. The density of water is 1000 kg/cubic meters at 4 Celsius. In physics, the weight of the substance…
When a number of people take a test, whether they are students in a class or candidates for a job opening, the average score is an important statistic for those administering the test and those taking it alike. The easiest…
Humans use simple machines every day, possibly without even noticing. A car, for example, uses its axles and wheels to make moving easier by redistributing the force caused by its bulk onto more mobile surfaces, and parts of a car…
From the tiniest bacterium to the largest blue whale, all living organisms are classified by their characteristics. The biologist Carolus Linnaeus first grouped organisms into two kingdoms, plants and animals, in the 1700s. However, advances in science such as the…
Rotational motion is one of the most important things to understand when you’re learning classical physics, and converting a rotational velocity to a linear speed is a key task in many problems. The calculation itself is fairly straightforward, but it’s…
If asked to list the chemical elements that make up most of the Earth, you might be surprised by how hard it is to guess the right elements without knowing more than the average person does about all of that…
Calculating the perimeter and area of geometric shapes like circles and squares is a skill you can use throughout your life. It comes in handy every time you build something, arrange something, or just try to figure out if one…
Flowers are the distinguishing characteristic of flowering plants, or angiosperms, that make up a majority of the plant kingdom. They are the reproductive organs of a plant that gradually develop into fruits. A flower may be of two types –…
The hippopotamus is a herbivorous mammal that inhabits African rivers and streams south of the Sahara Desert. Third in size among land animals only to the elephant and the white rhinoceros, the male hippopotamus can weigh more than 9,000 pounds.…
Map scales are extremely important when determining the actual distance between two places. All map scales, such as verbal, fractional and bar scales, involve ratios because you are comparing the distance between two points on a map and the actual…
