2014届高考英语一轮复习全方位配套训练人教版必修一Unit 5 Nelson Mandela--a modern hero 阅读理解3

　　第Ⅲ组

　　A

　　An experiment

　　Materials:Newspaper,‘ACE’ hardware ruler,a flat table.

　　Purposes:We’ll show that there is air pressure pushing on us,from every direction while we’re on this earth.

　　Procedure:

　　First put a thin ruler on a flat table with a little less than half of it hanging off the edge of the table（see the drawing on the right).Next place a sheet of newspaper over the ruler flat against the table.Make sure to have as little air as possible under the paper so that the fold line of the newspaper is at the ruler.Then quickly strike the end of the ruler hanging off the edge of the table.If you strike it quick enough,the ruler will break near the table edge.

　　What抯 going on?n

　　The earth is covered in a layer of air that is nearly 80 miles thick and at sea level exerts or 損ushes?hard almost 15 pounds of pressure per square inch.That means that a full sheet of newspaper laid out flat has nearly 9,300 pounds of air above it.le

　　When you break the ruler above,you are able to break it because of the “heavy” air pushing down on the paper while you quickly strike the ruler.At first,the table is pushing back on the paper,and if you move the ruler quickl enough,other air around the edges of the paper can’t get under the paper fast enough,so you are trying to lift that 9,300 pounds with the ruler! Some air gets under the paper,but not enough,so the ruler breaks.

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