Units

1 micron = 1 Millionth of a metre (10^-6)

1 mile = 5,000 feet (original definition mille passus, 1 passus = 5 feet)
1 mile = 5,280 feet
1 mile = 8 furlongs

1 gallon = 4 quarts = 8 pints
1 quart = 32 ounces
1 pound = 16 ounces
1 ounce = 16 drams
1 cup = 8 ounces = 250 millilitres

1 US Liquid Quart = 0.94640 Litre
1 kilogram = 2.2 pounds
1 pound = 453.56 grams

1 acre = 43,560 sq feet
1 hectare = 10,000 sq metres = 2.47 acres

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