Sciences de la terre et écologie Question #5113

trish brooks (Genre: femelle, Àge: 56 années) de Ottawa sur 6 novembre 2010 demande:

We used to have a wooden stick on the outside of our house. It measured air pressure or humidity or something. It seemed that when the air pressure increased the wooden stick would point up, and when it dropped the stick pointed down. Do you know what kind of wood that is (or even where you find something like that)?

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La réponse

Barry Shell répondu le 7 novembre 2010

 A quick google search yielded a lot of information on "Weather Sticks". According to many websites they really do work. They are made of young balsam fir twigs or other tree twigs. One of the best explanations is at the Weather Stick Science page.

Here's a place in Canada to get these:

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