"Residual moisture" refers to the small amount of moisture or dampness that remains in something even after it has been dried or reduced. Full definition
Just make sure the surface is level enough, and dust and dirt - free — and that there are no signs of residual moisture. (tiles-direct.com)
One research result, in particular, bears a direct consequence in practice: The higher the desired voltage, the less residual moisture the materials may contain. (sciencedaily.com)
On January 1, 2004 the Department of Energy (DOE) changed its method for calculating the standard from EF to «Modified Energy Factor,» the calculation of which is (MEF) = C / (ME+HE+DE), where DE is the dryer energy needed to dry a load based on residual moisture content in the clothes and load size. (treehugger.com)