Which of the following is a valid conversion factor? 1,000ml/1l 1hm/1,000m 1 cm^3/1 l 1,000cg/1g

The fraction which describes the relationship between two different units is said to be conversion factor. The conversion factor is always comes out to be 1.

The valid conversion factor is 1 L = 1000 mL.

Other given factors are invalid, as

1 hectometer is not equal to 1000 m as 1 hectometer is equal to 100 m.

1 is not equal to 1 L as 1 is equal to 1 mL and 1 = 0.001 L.

1000 centigram is not equal to 1 g as 1 centigram = 0.01 g.