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Though it may seem like nothing, the air around you has a density. The density of air can be measured and studied for features of physics and chemistry such as its weight, mass or volume. Scientists and engineers use this…
No matter how careful we are when conducting experiments, there will almost certainly be uncertainty in our results. No experimental apparatus is perfect, and avoiding error altogether is practically impossible because our world is full of countless idiosyncrasies and unpredictable…
Pressure is a word with many connotations, some of them more foreboding than others: Your tire pressure looks low. The pressure is on for the final exam. The barometric pressure drop signals a strong chance of … Wait. Was that…
A pulley system makes it easier to lift an object than lifting the weight by hand. A single pulley essentially changes the direction of the pull or force applied. When a person uses two or more pulleys in a system,…
The Nernst equation, named after chemist Walther Nernst, is used in electrochemistry to determine the point at which a redox reaction in an electrochemical half-cell reaches equilibrium – this also determines when the instantaneous cell potential has reached zero. The…
Mathematicians, physicists and engineers have many terms to describe mathematical relationships. There is usually some logic to the names chosen, although this is not always apparent if you are not aware of the math behind it. Once you understand the…
Barometric pressure (also called atmospheric pressure) is the measure of air pressure in a given area. Air pressure is the weight of air pressing down on a specific area, and it is measured with an instrument called a barometer. These…
A polygon by definition is any geometric shape that is enclosed by a number of straight sides, and a polygon is considered regular if each side is equal in length. Polygons are classified by their number of sides. For example,…
Knowing how to find a fraction of a number is a handy skill for home project measurements, reducing recipes or calculating discounts. You can find two-thirds of a number using either fractions or decimals. Remember that “of” in a math…
Microscopes magnify the tiniest inhabitants of this world. From the minute details of cells to the delicate cilia of paramecium to the intricate workings of Daphnia, microscopes reveal many minuscule secrets. Calculating total magnification power uses simple observation and basic…
