The Handy Math Answer Book
the foot was officially defined in terms of the new metric standards being adopted overseas. In the United States, the Metric Ac ...
The traditional poundas a unit of weight was used throughout the Roman Empire. But like many other measurements over time, the n ...
were not happy with the troy pound, as it was less than the commercial pound in most of Europe. In response, the mer- chants dev ...
But like most measurements over time, not all gallons were alike. During the American colonial period, the gallons from British ...
units. It actually consists of two related systems: the U.S. customary units and the British Imperial System. The background of ...
meter (distance) kilogram (mass; related to weight) second (time) ampere (electric current) Kelvin (temperature) mole (amount o ...
American system metric prefix/symbol number 1 trillion tera- / T- 1012 1 billion giga- / G- 109 1 million mega- / M- 106 1 thous ...
megaohm). There are exceptions, though, especially if the resulting prefix and unit sound fine, such as a milliampere. There are ...
as the volume of one cubic decimeter, and the kilogram was the weight of a liter of pure water. The standards metamorphosed over ...
tube, which responded to changes in temperatures. He arbitrarily decided that the dif- ference between water freezing and boilin ...
Europe around 20,000 years ago recorded days between successive new moons. Anoth- er hypothesis states that the measurement of t ...
What was one of the first devices used to measure time? One of the first devices—smaller than the obelisks mentioned above—to me ...
constant, or repetitive action (or process) that will effective- ly mark off equal increments of time. For example, in the old d ...
the length of the tropical year 1900. But like most measurements, the second definition changed again in 1964, when it was assig ...
the heliacal rising (when a star is finally seen after being blocked by the Sun’s light) of the star Sirius, the brightest star ...
Sun’s direct rays are on the latitudes marked tropic of Capricorn [winter in the North- ern Hemisphere; summer in the Southern H ...
What was the Roman calendar? The first Roman calendar, according to legend, appeared when Rome was founded around 750 BCE. When ...
year, but 2000 was a leap year. (Today, the Gregorian calendar “rules” state that every year divisible by four is a leap year, e ...
the number of days in the week: 365/7 52, with a remainder of 1 (or 52.142857...). This means that a given year usually begins ...
THE BASICS ...
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