Many laboratory furnaces have small glass windows that provide visual access to samples. The leakage of furnace atmosphe

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Many Laboratory Furnaces Have Small Glass Windows That Provide Visual Access To Samples The Leakage Of Furnace Atmosphe 1 (37.8 KiB) Viewed 34 times

Many laboratory furnaces have small glass windows that provide visual access to samples. The leakage of furnace atmospheres through the windows can be a problem. Consider a 3-mm-thick window of vitreous silica in a furnace containing an inert, helium atmosphere. For a window with a cross-sectional area of 900 mm, calculate the steadystate flow of helium gas (in atoms/s) across the window if the concentration of helium on the high-pressure (furnace) surface of the window is 6.0 x 1023 atoms/m' and on the low-pressure (outside) surface is essentially zero. The diffusion coefficient for helium in vitreous silica at this wall temperature is 1.0 x 10-10 m? S. Express your answer to three significant figures. IVACO 1 vec ? The flow of helium gas is atoms/s.