R-Values. An insulating materialâs resistance to conductive heat flow is measured or rated in terms of its thermal resistance or R-value -- the higher the R-value, the greater the insulating effectiveness. The R-value depends on the type of insulation, its thickness, and its density.he effectiveness of an insulation materialâs resistance to heat flow also depends on how and where the insulation is installed. For example, insulation that is compressed will not provide its full rated R-value.
So for me, âtarry scantâ simply means to âmove on quicklyâ. But to others it has meant different things. This is particularly true when Tarry is used as an adjective. In this case it is pronounced differently and comes from the root, âtarââ¦that thick, black sticky stuff.
Microhematuria refers to blood in urine that is visible only under a microscope; there is so little blood that it cannot be seen without magnification. Hematuria, whether gross or microscopic, is abnormal and should be further investigated.