For wholesale meters, the smallest unit is 5 L or 1 gallon.

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Multiple Choice

For wholesale meters, the smallest unit is 5 L or 1 gallon.

The main idea here is the meter’s resolution—the smallest amount it can indicate. If the smallest unit is 5 liters or 1 gallon, the meter can only read in those increments: you can distinguish readings that differ by 5 liters when using liters, or by 1 gallon when using gallons. A reading of 0.5 liter is smaller than that resolution, so it wouldn’t be readable on this meter. A reading of 5 liters matches the stated smallest unit exactly. A reading of 10 liters is a multiple of the smallest unit (two steps), not the smallest one itself. A reading of 2 gallons corresponds to two increments of the gallon scale (since the unit is 1 gallon), so it also isn’t the smallest. Therefore, 5 liters or 1 gallon is the correct smallest measurable unit.

The main idea here is the meter’s resolution—the smallest amount it can indicate. If the smallest unit is 5 liters or 1 gallon, the meter can only read in those increments: you can distinguish readings that differ by 5 liters when using liters, or by 1 gallon when using gallons.

A reading of 0.5 liter is smaller than that resolution, so it wouldn’t be readable on this meter. A reading of 5 liters matches the stated smallest unit exactly. A reading of 10 liters is a multiple of the smallest unit (two steps), not the smallest one itself. A reading of 2 gallons corresponds to two increments of the gallon scale (since the unit is 1 gallon), so it also isn’t the smallest. Therefore, 5 liters or 1 gallon is the correct smallest measurable unit.

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