K.C.S.E Physics Q & A - MODEL 2016PP1QN03

K.C.S.E Physics Q & A - MODEL 2016PP1QN03

When a drop of oleic acid of known volume is dropped on the surface of water in a large trough, it spreads out to form a large circular patch. 
State one assumption made when the size of the molecule of oleic acid is estimated by determining the area of the patch. 
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answer

• Drop spreads out until the patch is one molecule thick