Is an empty jar really "empty"? Does air have mass? Bio Ss are asking + answering the tricky questions today as we zoom in on air! #teach180 http://pic.twitter.com/Q7346ukaWa
— Michelle Vanhala (@MsVanhala) September 19, 2017
Is an empty jar really "empty"? Does air have mass? Bio Ss are asking + answering the tricky questions today as we zoom in on air! #teach180 http://pic.twitter.com/Q7346ukaWa
— Michelle Vanhala (@MsVanhala) September 19, 2017
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