Specific Impulse and Absolute Chemical Hardness

11 September 2020, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


The present work is dedicated to show that there are relationships between the absolute chemical hardness (η) of monopropellants and their specific impulse (Is). A total of sixteen monopropellants have been modelled and the absolute hardness obtained by quantum chemical calculations. The following equation was obtained: Is = 17.562 η + 125.551, providing specific impulse results in very good agreement with reference values.


Specific impulse
absolute hardness,
empirical equations


Comments are not moderated before they are posted, but they can be removed by the site moderators if they are found to be in contravention of our Commenting Policy [opens in a new tab] - please read this policy before you post. Comments should be used for scholarly discussion of the content in question. You can find more information about how to use the commenting feature here [opens in a new tab] .
This site is protected by reCAPTCHA and the Google Privacy Policy [opens in a new tab] and Terms of Service [opens in a new tab] apply.