PI stands for polarization index.
We need to find IR value(IR1) for 1min and again find the IR value(IR2) for 10min.
PI=IR2/IR1
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it is pi..... wait no it isnt.....pi squared to the one half power is not pi...
no, 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679 8214808651328230664709384460955058223172535940812848111745028410270193852110555964462294895493038196 4428810975665933446128475648233786783165271201909145648566923460348610454326648213393607260249141273 724587006606315588174881520920962829254091715364367892590360011330530548820466521384146951941511609...
Any circle's circumference divided by its diameter has a value of pi
The value of pi is as follows: 3.14159265358979323846264338327950288419716939937510 etc.
The Egyptians calculated pi to be 3.16.