# Dependency of $\mathrm{H_2O}$ surface tension on vapour pressure

How is does the surface tension between:

• liquid water, and
• humid air

depend on

• $\mathrm{H_2O}$ partial pressure in the air, and
• temperature?

Edit: I assume that temperature and humidity will both lower the surface tension. But I'm searching for equations to quantify this effect.

I was trying to correlate, condensed particulate sizes in turbulent flow to changes in ambient parameters. The humidity and temperature might be important influence parameters, which influence surface tension and therefore droplet size in turbulent flow.

I can ensure, that this is not a homework question. I was searching information on this for my professional work. Unfortunatly googling did not give me the results I hoped for.

• This is intereting Informationen Pieter. Thank you. – BerndGit Feb 14 '18 at 7:53
• It doesn't seem homework for me. – peterh says reinstate Monica Feb 14 '18 at 10:13