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Column Thirty Four

Watch this video and then answer the question below.

Question:  listen carefully, and watch the falling mercury column. Record your answer in the boxes provided  (e.g. xxx / yyy)

  /   mm Hg

 

1  2   3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34

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BHS 1999