No.
The units of the two variables in a correlation will not change the value of the correlation coefficient.
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No, r is a coefficient.
cause n affect
Correlation is scaled to be between -1 and +1 depending on whether there is positive or negative correlation, and is dimensionless. The covariance however, ranges from zero, in the case of two independent variables, to Var(X), in the case where the two sets of data are equal. The units of COV(X,Y) are the units of X times the units of Y. correlation is the expected value of two random variables (E[XY]),whereas covariance is expected value of variations of two random variable from their expected values,
1 kp=1.4 S.C.U. (Strong-Cobb Units)
No. The strongest correlation coefficient is +1 (positive correlation) and -1 (negative correlation).