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One pane of glass will allow 90 percent of light through. A second pane will allow 90 percent of that 90 percent, which is equal to 81 percent of the original light source.
81 km = 81,000 meters
what is difference between 18 & 81 in general knowledge
81F equates to 27.2C
The number of unpaired electrons in Tl-81 ion is zero, this in case of ejection of one electron from Tl-81 atom. Thx!!