Here we use the symbol ii to represent a dimensionless product For equation f(u 2:35 We can rearrange to I1=(2,2,→) Usually, the reference dimensions required to describe the variables will be the basic dimensions m.l. and t or f.l. andt In some cases, maybe only two are required, or just one determination of pi terms??? Heat Transfer Su Yongkang School of Mechanical EngineeringHeat Transfer Su Yongkang School of Mechanical Engineering # 8 Here, we use the symbol to represent a dimensionless product. For equation, We can rearrange to,  ( ) k u f u ,u ,...,u 1 = 2 3 ( )  =   k−r , ,..., 1  2 3 Usually, the reference dimensions required to describe the variables will be the basic dimensions M, L, and T or F, L, and T. In some cases, maybe only two are required, or just one. determination of Pi terms???