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Some representative refractive indices; Name of material λ (nm) Refractive index no. n Reference Vacuum: 1 (by definition) Air at STP: 1.000273 [citation needed]Gases at 0 °C and 1 atm
Renewable sources account for 28% of all electricity produced, with hydro alone reaching 13%, followed by solar at 6%, wind at 4%, bioenergy at 3.5%, and geothermal at 1.6%. [228] The rest of the national demand is supplied by fossil fuels (natural gas 38%, coal 13%, oil 8%) and imports. [ 228 ]
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