The United States system of units is similar to the British imperial system. Both systems are derived from English units, a system which had evolved over the years before American independence, and which had its roots in Roman and Anglo-Saxon units.
~Wikipedia
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There are hundreds of different units within the Imperial system. Some of these areLength:inch, palm (=3"), hand (=4"), foot, yard, rod, chain, furlong, mileArea:square inch, square foot, etc, rood, acreVolume:cubic inch, cubic foot etc, (fluid) ounce, gill, cup, pint, quart, gallon, bucket, bushel, barrel, hogsheadMass:pennyweight, ounce, pound, stone, hundredweight, quarter, tonEnergy:BTU, calorie, horsepower, therm.In addition there are many more derived units such as pounds per square inch.Note - the old English system was called Imperial - NOT English. In England the people now use the "Metric System" and have done so for some time now.
It is the English units for Fracture Toughness (K1c) of a specific material.
There 12 inches to a foot, so 120 tenths of an inch to a foot.
In one inch there are hundred 100ths of a inch Since there are 12 inches in a foot, there will be 12 x 100 = 1200 hundredths of an inch in a foot
1 foot = 12 inches 1 inch = 1/12 of a foot