A Moment of Science

Posts tagged piston

August 17, 2012

 

sign at gas pump

What Do Octane Numbers Mean?

You probably visit a gas station every few days, but have you ever paid attention to octane numbers?

April 14, 2009

 

Inside train tunnel

Popping Ears on a Train

When a train enters a tunnel, it compresses the air in front of it like a piston. Air in a tunnel can't be simply pushed aside--the tunnel walls are in the way.

September 27, 2003

 

Ear-friendly Train Tunnels

The most famous tunnel is the thirty mile “Chunnel” between England and France. Thirty miles of air is a lot to push around, so engineers have come up with a clever solution. The Chunnel is actually two separate tunnels, connected by cross passages.

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