I'm assuming you mean a cube with a volume of 4.5 (cubic inches).
1 inch = 25.4 mm, so 1 in3 = (25.4 mm)3 = 16387.064 mm3
4.5 in3 * 16387.064 (mm3 / in3) = 73741.788 mm3
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cubic cm x 1,000 = cubic mm (mm3)
Multiply by 1000 to convert cubic cm into cubic mm
2m is 2000mm
1,000 cubic mm = 1 mL1 cubic mm = 0.001 mL
divide by 1000 Reason: one cubic mm is 1/1000 the size of 1 ml
18cm convert into mm