An ounce can be used to measure both ‘volume’ and ‘weight’. When measuring liquid ingredients, the ounce is a volume measurement. One cup of most wet ingredients such as milk or chicken broth will equal eight ounces when using a measuring cup. Yet 1 cup of dry flour weighs about 4 1/2 ounces and 1 cup of sugar weighs about 7 ounces. Shredded or grated cheese is considered a dry ingredient.  If my recipe lists an ingredient in ounces only, it is a ‘weight’ measurement. ‘Volume’ measurements are measured with measuring cups and spoons. ‘Weight’ measurements are measured with a food measuring scale. Where there may be any doubt, and for shopping purposes, I have listed both volume and weight measurements in my cookbook.