instrument runwayinstrumental errorinstrumental phaseinsulateinsulated cableinsulated streaminsulating blanketinsulating brickinsulating concreteinsulating lightweight concreteinsulating materialinsulating plasterinsulating wallinsulationinsulation of concreteinsulatorintakeintake areaintake factorintake of a wellintake of groundwaterintake portintake structureintake towerintake wellintellectionintensityintensity duration curveintensity factorintensity of elastic massintensity of fictious massintensity of loadintensity of soundinter transitioninteractance modelinteractioninteraction curveinteraction diagraminteraction equationinteraction formulainteraction methodinterbededintercepting ditchinterceptioninterceptometerinterceptor sewerinterchangeinterchange designinterchange rampintercity bus