Based on some general principles of quantum mechanics and general theory of relativity, one can argue that space-time is fundamentally not smooth. Instead, in a quantum theory of gravity space-time would have a foamy, jittery nature and would consist of many small, ever-changing, regions in which space and time are not definite, but fluctuate.

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INTRODUCTION


Metal foam is a dispersion of gas bubbles in a metallic bulk material
These are extremely lightweight materials
It contains 50% or more holes
They have some very promising properties

Structure o f metal foam
In metal foams cells are divided into distinct cells. the boundaries of these materials are made of solid material, the interior are voids.


Light weight Al foam
The best quality metal foams presently available
It has a density of from 300 to 1,000 kg/m , that is, ....etc

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METAL FOAM

PRESENTED BY :cloud2511


abstractor
A metal foam is a cellular structure consisting of a solid metal, For ex. aluminium, containing a large volume fraction of gas-filled pores.
The pores can be sealed (closed-cell foam), or they can form an interconnected network (open-cell foam).
The defining characteristic of metal foams is a very high porosity: typically 75-95% of the volume consists of void spaces.
The strength of foamed metal possesses a power law relationship to it ....etc

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