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 con
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Exhaust
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
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
How Does a Rocket Engine Work?
You can make a simple rocket by filling a toy balloon with air and letting it go. Rockets work on the Newton’s principle that every action
Why Does a Jet Plane Leave a Vapor Trail?
Why Does a Jet Plane Leave a Vapor Trail? The white streaks planes leave behind are actually artificial clouds called contrails, which is a