1 and a half cm
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A reasonable length for a [new] pencil is 15 cm. After much [use and] sharpening, it may be reduced to a pencil [stub] only 1.5 cm = 15 mm long.
50
1 mm = 1,000 um 10 mm = 10,000 um 15 mm = 15,000 um
15*15*15 = 3375 cubic mm = 0.003375 litres
150 mm, there is 10 mm in 1cm, therefore 150 mm would be equal 15 cm.