hello all and thank you for reading this. any and all help will be greatly appreciated. i am trying figure out if air pressure can be converted to horsepower.

i know what 1 horsepower is equal to in the sense of work performed. although horsepower does seem to be a rather vague way of describing work. what has me backwards is if the energy created by air pressure can be coverted over to horsepower.

so if x amount of air pressure pushes down on a y size piston how much energy can be transfered through the piston?

if none of this makes sense let e know and i'll try to explain better. it seems easy to think about but for some reason just has me all confused when i try to solve it.

thank you