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A barometer is any instrument that measures air pressure. Barometers come in two basic forms: the aneroid barometer and the mercury barometer. Aneroid barometers use cells that expand and contract as air pressure changes. Air pressure is measured by attaching…
The mass of a star is the single characteristic that determines that heavenly body’s fate. Its end-of-life behavior depends entirely upon its mass. For lightweight stars, death comes quietly, a red giant shedding its skin to leave the dimming white…
Compact fluorescent light bulbs (CFLs) have taken the place of incandescent bulbs in many homes and offices. Fluorescent lights last longer and use less energy, which saves money. They also produce power in a different manner than incandescents do, delivering…
An exponent represents how many times a number should be multiplied by itself. For example, x3 (or x cubed) would be written out as x × x × x. Canceling out a component in an equation requires using the opposite…
When you think of a crab, you probably picture a bright red ocean creature with large front claws and legs that stick out to either side of its body. But this common image doesn’t accurately represent all crabs. These amazing…
The cubic feet per minute (CFM) of a gas describes its volumetric flow rate through a pipe or vent. The volumetric flow is a good measure of how much gas goes through the system, but it isn’t the clearest way…
Concentration of a dissolved compound in the solution can be calculated using several approaches. Molarity refers to a number of moles of the compound in 1 liter of the solution and expressed in molars (abbreviated as “M”). Molarity=number of moles/Volume…
A ratio is a way of comparing any two parts of a whole. You might use a ratio to compare the number of boys in a room to the number of girls in a room, or the number of students…
The best way to factor polynomials with fractions begins with reducing the fractions to simpler terms. Polynomials represent algebraic expressions with two or more terms, more specifically, the sum of multiple terms that have different expressions of the same variable.…
Because the height of the trapezoid does not usually lie along an edge of the shape, students have a challenge when it comes to finding the exact height. By learning the geometric equation that relates the trapezoid’s area to its…
