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SURFACE TENSION How many drops of water can a penny hold?
Cohesion is the tendency of molecules within a substance to ‘stick together’. Water has a high cohesion because of hydrogen bonding. This is important as transport of water in the Xylem in plants relies on water being pulled up. Cohesion also gives the water a high surface tension, allowing small organisms, such as Pond Skaters, to walk along it.
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credit: YT/Ryan DeLaHaye
TESTING FOR GASES Sound on! The fantastic @emilia.science demonstrates three common tests for gases: Carbon dioxide extinguishes a lit splint, a glowing splint will ignite in oxygen and hydrogen burns with a squeaky pop! Learn these if you’re sitting your GCSEs!
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credit: @emilia.science
EVOLUTION This fantastic animation by @john_gurche_paleoart shows the potential evolutionary changes over time between our ancient ancestors and modern-day man, based on fossil evidence such as those of ‘Ardi’ and ‘Lucy’ that were both found in Africa
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credit: @john_gurche_paleoart