# What is the formula  for thepack ingfraction in soild State

Arun
25757 Points
4 years ago

• Packing faction or Packing efficiency is the percentage of total space filled by the particles.

• Both  hcp & ccp though different in form are equally efficient. They occupy the maximum possible space which is about 74% of the available volume. Hence they are called closest packing.

• In addition to the above two types of arrangements a third type of arrangement found in metals is body centred cubic (bcc) in which space occupied is about 68%.

• Packing Efficiency =