Moisture Posted on 7th December 201516th May 2021 by ThePD (The Project Definition) Moisture is a small amount of liquid such as water that is in the form of vapour or condensed on a surface. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Engineering and tagged gas, liquid, property, water. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.