Packing Efficiency
Chapter Name : The Solid State |
Sub Topic Code : 102_12_01_08_01 |
Topic Name : Packing Efficiency |
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Sub Topic Name : Packing Efficiency In HCP And CCP Structures |
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Introduction
• In whatever way the particles (atoms, molecules or ions) are packed, there is always some free space in the form of voids. • Packing efficiency is the percentage of total space filled by the particles.
Pre-Requisites:
Particles, 2D and 3D close packing structure, octahedral and tetrahedral voids.
Activity:
Sal t and sugar crystals are arranged in 3 dimensional closed packed structures.
Real Life Question:
How are particles of solid arranged?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Packing efficiency | Packing efficiency is the percentage of total space filled by the particles. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Blocks, marbles | Use marbles or blocks to construct different types of closed pack structures. |
Real life uses :
Close packed structures have less void spaces and therefore have strong solid structures.
Places to visit :
Kitchen
Practical examples around us
| Examples | Explainations |
|---|---|
| Salt, sugar crystal | A sugar crystal is compact and 3 dimensional cuboid structure. |
What you learn in Theory:
• Packing efficiency is the percentage of total space filled by the particles.
What you learn in Practice:
The closely arranged are the atoms in a solid structure, higher is the packing efficiency. HCP and CCP structures have the highest packing efficiency among solids.