Electric bulbs are filled with :
Filling a bulb with an inert gas such as argon or nitrogen slows down the evaporation of the tungsten filament compared to operating it in a vacuum.
16, 24, 60, 210, ?, 5197.5
18 ? 20 13 22 11
4, 6, 12, 30, ?, 315, 1260
120, 122, 128, ?, 272, 992
16, 24, 36, ?, 81, 121.5
195% of 1420 + 72 × 25 =?
15, 8, 9, 15, 32, ?
14, 20, ?, 50, 74, 104
827, 820, 806, 785, 757, ?
49, 70, 112, 175, ?, 364
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