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What are the standardized chamber pressure and exit pressure values used for comparing the specific impulse values or various design parameters of different rocket engines?

What are the standardized chamber pressure and exit pressure values used for comparing the specific impulse values or various design parameters of different rocket engines? Correct Answer 1000 psia, 1 atm

Specific impulse and other design parameters of various rocket engines are compared with one another while assuming some general standard values for the chamber pressure and exit pressure. A chamber pressure of 1000 psia and an exit pressure of 1 atm are typically in use today. (1 psia = 6894.76 Pa and 1 atm = 101.325 Pa).

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