how to change the density of a material?

Answer 1

Heat it or cool it (change the temperature T)

Put in under higher or lower pressure (change the pressure P)

Squeeze it, or allow it in a bigger volume (V)

Answer 2

If we know the reason why you want to change the density and what are some of the other control parameters may be somebody can help, otherwise density is tied to the true material.

People try to change the density of certain materials by adultration but then the material is not the same any more - like yellow gold, white gold, red gold etc; crystal glass with a certain amount of lead, borosillicate glass etc.; polyethlene - high or low density HDPE, LDPE etc.

Density is one of the properties how materials are identified and segregated.

Answer 3

Density=(Mass/Volume).
Change the mass of the material or volume of the material by keeping the volume and mass constant respectively.
If you could do that you can change the density of the material.
I think you could not do that. If we could do that, then the density of elements can't be given as constants.
Bye,
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Answer 4

Density is weight divided byvolume. Therefore to change the density of a material you either change its weight while keeping its volume the same or change its volume while keeping its weight the same. Changing volume is often easier by either compressing it or expanding it. One way is by applying pressure to the material to achieve compression or change its temperature to expand it or compresse it. Examples of materials that changes density are a) water when boiled has less density b) warm air is less dense and rises.

Answer 5

may be compaction is useful if the material is grians
but maetals u have to add another material (to make alloys)
it gives u another material with different properties

Answer 6

Answer of Hk is proper.