Why are liquids usually difficult to compress?

a. Their atoms are held in position

c. Liquids have a definite shape

b. Their atoms are already packed closely together

d. Liquids are not difficult to compress

Liquids usually difficult to compress because their atoms are already packed closely together. The answer is letter B. The particles can move or slide past each other due to the small space available for movement. It cannot be compressed further due to the repulsive forces that acts between them. The kinetic energy is medium.