A spark plug is made of a center electrode, an insulator, a metal casing or shell, and a side electrode (also called a ground electrode). The center electrode is a thick metal wire that lies lengthwise within the plug and conducts electricity from the ignition cable hooked to one end of the plug to the electrode gap at the other end.
color of candles It turned out, in the end, pink candles burn the longest, although, it was only off by 0.1 cm. Candles burn faster the first time you light them. Then as you light them again, they burn slower. Blue is in 2nd place, white and gold/yellow are tied for 3rd and green burns the fastest. most scented candles or birthday candles burn out
1 You never want any soot or smoke at any time - ever.  Let the candle burn long enough to get the entire top liquid wax. This takes about an hour per inch in diameter of the vessel. So if your candle is 3 wide, let it burn for at least 3 hours. If it doesn't melt all the way to the edge don't panic, but get as close as you can. Sometimes the last 1/4 will burn as the candle goes down.