An Elementary Introduction to the Wolfram Language
17Units
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You can use InputForm to see how the Wolfram Language internally represents this.
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You can always enter quantities directly like this, or you can use ctrl+=, either for the whole thing, or just for the units.
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Divide one length by another:
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Use dollars in a computation:
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If you leave off the Degree or °, the Wolfram Language will assume youre talking about radians, which go from 0 to 2π (about 6.28) around a circle, rather than degrees, which go from 0 to 360.
π/2 radians is equivalent to 90°:
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Make a list of rotations in degrees from 0 to 360:
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Theres lots to do with angles. For example, AnglePath gives the path youd follow if you successively turned by a sequence of angles.
Start off horizontal, then turn three times by 80°:
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Keep turning by 80° and youll eventually get back to where you started:
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17.1Convert 4.5 lbs (pounds) to kilograms. »
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17.2Convert 60.25 mph to kilometers per hour. »
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17.3Find the height of the Eiffel Tower in miles. »
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17.4Find the height of Mount Everest divided by the height of the Eiffel Tower. »
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17.5Find the mass of the Earth divided by the mass of the Moon. »
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17.6Convert 2500 Japanese yen to US dollars. »
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17.7Find the total of 35 ounces, 1/4 ton, 45 lbs and 9 stone in kilograms. »
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17.8Get a list of the distances to each planet using the "DistanceFromEarth" property, and convert all the results to light minutes. »
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17.9Rotate the string "hello" by 180°»
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17.10Make a table of a size-100 A rotated by 0° through 360° in steps of 30°»
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17.11Make a Manipulate to rotate an image of a cat between 0° and 180°»
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17.12Generate graphics for a path obtained by turning 0°, 1°, 2°, ... , 180°»
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17.13Make graphics of the path obtained by turning a constant angle 100 times, controlling the angle from 0° to 360° with a Manipulate»
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17.14Make graphics of the path obtained by successively turning by the digits of 2^10000 multiplied by 30°»
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+17.1Convert 4.3 light years to furlongs. »
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+17.2Convert 20,000 leagues to miles. »
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+17.3Make a Manipulate to rotate a size-200 W to any angle from 0° to 360°»
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+17.4Rotate an image of the Great Pyramid by 180°»
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+17.5Generate a list of letters of the alphabet, each randomly rotated. »
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+17.6Generate graphics for a path obtained by turning 100 times through a random number of degrees between 0 and 360. »
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What unit abbreviations does the Wolfram Language understand?
Does the Wolfram Language pick units based on what country Im in?
Only to interpret input like 5 kg. If you type Quantity[5, "Kilograms"] you dont need the networkexcept to deal with units like currencies whose values are always changing.
What can I do if my unit conversion gives me an exact fraction but I want a decimal number?
Use the function N[...] to find a decimal approximation. Or add a decimal point to a number in your input. Well talk more about this in Section 23.
Why dont I get the same result for the currency conversion example?
 
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