We usually measure our car's consumption in l/100km. If you simplify the units, this actually becomes a measure of area, 0.001 mm² to be precise:
1l/100km = (0.001 m³) / (100000 m) = m³ / (100000000 m) = 1e-8 m² = 0.001mm²
The physical interpretation of this is, that if your car "ate" a noodle made of fuel while driving (instead of using a fuel tank), then this value would be the cross sectional area of this noodle.
Just saw this interesting fact in some chatroom and found it worth sharing here (with permission).
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