Question

A sealed cooker made of steel of mass 500g has a volume of 3 litres will it sink or not if density of water is 1000kgm3

Answer 1

The deciding factor is the density of water. If an object has a lower density it will float. 

density of fresh water at 20C = 0.998 g/cm³ = 998 kg/m³ = 8.33 lb/gal = 62.1 lb/ft³ 

500g = 0.5 kg 
3L = 0.003 m³ 
density is 0.5 / 0.003 = 167 kg/m³, which is less than 998 kg/m³, so it will float. 

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