Question

Objects around us are made up of a large variety of materials.
A given material could be used to make a large number of objects. It is
also possible that an object could be made of a single material or of
many different types of materials.
Different types of materials have different properties.
Some materials are shiny in appearance while others are not. Some are
rough, some smooth. Similarly, some materials are hard, whereas some
others are soft.
Some materials are soluble in water whereas some others are insoluble.
Some materials such as glass, are transparent and some others such
as wood and metals are opaque. Some materials are translucent.
Materials are grouped together on the basis of similarities and differences
in their properties.
Things are grouped together for convenience and to study their
properties.​

Answer 1

Answer:

True, actual defination would be that they are divided into four stage solid , liquid , gas and vapour. and water is the only substance which can under go all the stages.

and Mercury is liquid at room temperature.

All stages have different properties according to thier molecular bonding.