Arrange following in the increasing order of rigidity :Sand, water, petrol, air, smoke, iron nails, towel

Arrange following in the increasing order of rigidity :Sand, water, pe

1.	Arrange following in the increasing order of rigidity :Sand, water, petrol, air, smoke, iron nails, towel
Answer» SAND -- Iron NAILS -- TOWEL -- PETROL -- Water -- Smoke -- Air