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
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Fuel
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, bl
Why Do Animals Need Oxygen?
Why Do Animals Need Oxygen? We must have oxygen to live. Every living animal cell needs oxygen for its vital metabolic activities (the proce
How Do Trains Work?
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
What Is an Internal Combustion Engine?
What Is an Internal Combustion Engine? An internal combustion engine is a heat engine where the combustion of a fuel occurs with an oxidizer