Hi.
I have a question about water density over 1 atm.
It could be a simple question but I don't know how.

I have two questions.
1) the way to find out the water density by pressure and temperature over 1 atm(Diagram or equations and so on)
2) density difference between saturation pressure and over it

I'm writing PSV safety test document.
Government asked to fill in all sheet including capacity in mass per hour(kg per hour).
Vendor wrote valve actual capacity in volume per hour(cubic meter per hour) so I need to convert it to mass per hour(kg per hour).

Can you tell me how to make it please?