On 5/04/22 6:36 am, Chris Angelico wrote:
5 L/100km in SI units is 5e-3 m³ / 1e5m. That's 5e-8 m². Or if you
prefer, 50mm².
Fuel economy is a unit of area.
This misses the rather important point that it's not just
litres of empty space, it's litres *of fuel*. You really
need to consider "litres of fuel" to be an indivisible
unit that doesn't cancel with a distance.
Alternatively, measure the fuel by mass rather than volume.
Then your fuel consumption is in kg/100km, which is in
far less danger of being cancelled down.
Or you could measure the fuel in moles... but then since
moles are dimensionless, you get reciprocal distance...
Who would have thought units could be such fun?
--
Greg
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