Question : Which of the following liquids has the least density?
Option 1: Freshwater
Option 2: Saltwater
Option 3: Petrol
Option 4: Mercury
Correct Answer: Petrol
Solution : The correct option is Petrol.
The least dense of the listed liquids is petrol. Petrol has a specific gravity (or relative density) that varies from 0.7489 grams per cubic centimetre to 0.77 kg/l. The densities of freshwater, saltwater and mercury are 1 g/cm 3 , 1.03 g/cm 3 , and 13.6 g/cm 3 , respectively.