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Singapore mouth muffle AS NZS 1716 2012 standard

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The sodium D line at 589.26 nm (weighted mean of D1 and D2 lines) is the usual standard of wavelength but results from other wavelengths can often be interpolated from a plot of refractive index versus l/(wavelength)2. 1 the mouth of the tube is covered with aluminium foil and held fast with a tight rubber band near the lip. Charcoal is

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