(1) Liquids do not have fixed shape but have fixed volume: The inter-particle forces of attraction in liquids are weaker than the inter-particle forces between the particles in the solid state. However, the inter-particle forces are stronger, as compared to inter-particle forces in gases. Therefore, particles in a liquid are not fixed at their positions and can move, yet the inter-particle forces do not allow the particles to go beyond a definite limit. This keeps the volume of the liquid, constant, even when its shape is changing. Therefore, liquids do not have fixed shape and can acquire the shape of the container, in which it is kept. However, the volume of the liquid remains the same. 

(2) Liquids have lower density: As the inter-particle forces of attraction is weaker in liquids than in solid state. Thus, the number of particles per unit volume is less, which accounts for the lower density of liquids, when compared to solids. 

(3) Liquids can diffuse: As the inter-particle forces in liquids are not strong enough to keep them in fixed positions, thus, the particles may flow and this accounts for the fact, that liquids can diffuse. 

(4) Liquids are compressible: As the particles in a liquid can move, thus the volume of liquids can change and so, they are compressible in nature.