The preposition of is used in many ways.Another use is in
combinations of measurements and the items measured:
an acre of land
two cups of flour
a foot of water
a gallon of milk
several inches of rain
an ounce of perfume
a pint of whiskey
a pound of butter
two scoops of ice cream
a tablespoon of sugar
two teaspoons of cinnamon
a ton of coal
several yards of cloth
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A related use is in showing containers and the things
which are inside them:
two bags of potato chips
a bowl of soup
a box of candy
two bottles of catsup
a carton of eggs
several cans of corn
a cup of tea
two glasses of water
a jar of pickles
several jugs of wine
a keg of beer
a pack of cigarettes
two packages of gum
a pitcher of lemonade
several pots of coffee
a snifter of brandy
a tin of sardines
two tubes of toothpaste
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Next: more ways to use of