It contains minerals such as pyroxene, amphibole, feldspar and 63-68 percent silica. The eruption temperature for dacitic lava is 1,500 to 1,800 degrees Fahrenheit. Dacitic to rhyolitic lava is so dangerous because it contains a high amount of crystals.Mt. Vesuvius erupts according to the Plinian model of eruption.
Foil has low emissivity, so will greatly reduce radiative heat transfer (act like insulation). It should face the side that is supposed to be cooler. But foil will not reduce conductive heat transfer, so it must be used judiciously with something that reduces conduction.
Insulating your ductwork, particularly where the ductwork runs through unfinished areas of the home, will conserve energy and save money on utility costs if the insulation is properly applied. One type of material currently used to insulate ductwork is radiant bubble wrap. Bubble wrap duct insulation is a relatively new material, introduced to the construction industry within the past few years. HVAC experts are split with regard to opinions about this material. Some experts believe that bubble wrap duct insulation is an effective way to insulate the ductwork and conserve energy.