When Will a Car Engine Stall?
A car engine will stall—that is to say, it will suddenly stop when you do not want it to—if it is unable to provide sufficient power to overcome the load on the back...
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Why Do Aircraft Sometimes Leave Vapor Trails?
Vapor trails form in the sky because the water in the exhaust of aircraft engines condenses when it meets the cool air. Vapor trails, or condensation trails, are...
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Who Invented the Jet Engine?
The first flight by a jet-propelled aircraft was made in Germany on august 27, 1939. Its engine was designed by Hans-Joachim von Ohain, who had conceived the idea while...
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Why Do Exhaust Fumes Contain Lead?
The lead in exhaust fumes comes from the petrol used to drive the internal-combustion engine. Crude oil straight from the wells is thick, black and sticky. It has to go...
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How Do Trains Work?
Long before automobiles took to the roads and airplanes flew into the skies, people rode horses to get from one place to another quickly. Horses weren’t the best...
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