Question : An oil drop spreads over water because:
Option 1: oil is lighter than water.
Option 2: oil is more viscous.
Option 3: oil does not mix with water.
Option 4: surface tension of oils is much smaller than that of water.
Correct Answer: surface tension of oils is much smaller than that of water.
Solution : The correct option is surface tension of oil is less than that of water .
The surface tension of water causes oil droplets to disperse over it. Water has a higher surface tension than oil, therefore when oil is spilt over it, the water's higher surface tension pushes the oil in all directions, causing it to spread throughout the water. But oil only spreads when it comes into touch with the water's surface at a specific angle. As droplet size and interfacial tension increase, so does the maximum spreading length of oil droplets.
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