A 30 mm thick oedometer sample of clay reached 30% consolidation in 15 minutes with drainage at top and bottom. How many years would it take the clay layer from which this sample was obtained to reach 60% consolidation? The clay layer had one-way drainage and was 6 m. thick. a. 16.24 b. 18.27 c. 12.56 d. 14.78

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.