When a steel cookie sheet is placed in an oven and heated, it expands due the temperature change. The change in area of the cookie sheet is modeled using the following equation: AA = A,YAT where AA = change in area in in? Ao = original area in in y = area coefficient of thermal expansion AT = change in temperature in F° What is the appropriate unit for y if the preceding equation is to be homogeneous in units? O a. in? O b. F° O c. in O d. /°F

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Units and Dimensions

Dimensions are the basic concepts of the measurement of quantities. Units are the means of expressing the dimensions. For instance, an area has a dimension of L2 and a unit of m2.