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Thread: Try to use proper units

  1. #11
    Model S #P683 Blue 85 kWh woof's Avatar
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    Quote Originally Posted by Ben W View Post
    Well... Fuel economy (with gasoline) is properly measured in Gallons per Mile, which has units of volume (gallons) per distance (mile), which in metric is m^3 / m, or m^2. So gas mileage is technically measured in square meters. Figure that one out
    Obligatory XKCD: Droppings

    Ok, so what’s the physical interpretation of that number? Is there one?
    It turns out there is! If you took all the gas you burned on a trip and stretched it out into a thin tube along your route, 0.1 square millimeters would be the cross-sectional area of that tube.
    --Woof!
    On the Internet, nobody knows you're a dog.

  2. #12
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    Quote Originally Posted by Ben W View Post
    Well... Fuel economy (with gasoline) is properly measured in Gallons per Mile, which has units of volume (gallons) per distance (mile), which in metric is m^3 / m, or m^2. So gas mileage is technically measured in square meters. Figure that one out
    I`m from Europe. Could you elaborate "mileage in square meters"? Or was it just a joke

  3. #13
    TMS 85 owner :)
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    Quote Originally Posted by Ben W View Post
    Well... Fuel economy (with gasoline) is properly measured in Gallons per Mile, which has units of volume (gallons) per distance (mile), which in metric is m^3 / m, or m^2. So gas mileage is technically measured in square meters. Figure that one out
    Imagine the fuel stretched out along the road in the shape of a very long cylinder, and a car that picks the fuel up and burns it as it goes. The fuel economy is the cross-sectional area of the fuel cylinder!

    Let's see - 10 liters per 100 km. That's 10/1000 cubic meter of fuel, and 100 000 meters. (10/1000)m3/100000m = 0.1mm2.

    *edit* Dang - xkcd/woof already did that

    *edit 2* There's an error in the final equation in that XKCD post, a "per bird" is missing - email sent
    Last edited by eledille; 2012-11-16 at 01:08 PM.

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