#### Question

Apothecaries (druggists) use the following set of measures in the English system: 20 grains ap = 1 scruple (exact); 3 scruples = 1 dram ap (exact); 8 dram ap = 1 oz ap (exact); 1 dram ap = 3.888 g. 1 oz ap = _____ oz troy.

#### Solutions

Verified#### Step 1

1 of 21 oz ap (8 dram ap/1 oz ap)(3.888 g/1 dram ap)(1 grain/0.0648 g)(1 pennyweight/24 grain)(1 troy oz/20 pennyweight) = 1 troy oz.

1 oz ap = 1 troy oz.

Use the given conversion factors to convert oz ap to oz troy.

#### Step 1

1 of 5In this subtask, we need to convert **1 oz ap** to **oz troy (troy ounce)** using **dimensional analysis**.

This method uses **conversion factors** between different systems of units. The conversion factor is written in a ratio. This ratio needs to be written in a way that the unit needed is in the numerator. The unit that we're converting from needs to be in the denominator so it's canceled out.