Normal Shock Table: P02/P01 & P1/P02 Meaning

[gfd43tg]

Hello,

I am wondering, on a Normal Shock Table, what are the two most right columns supposed to mean?

What is the ratio P02/P01 and P1/P02 supposed to be?

 

[boneh3ad]

p_{02}/p_{01} is how the total pressure changes across the shock and is essentially a measure of how dissipative the shock is since total pressure loss is a result of the entropy gained across the shock.

p_1/p_{02} is effectively just a ratio that is useful in some calculations.