States/phases of matter
Matter is anything that has weight/mass and occupies space/volume. Naturally, there are basically three states of matter.
(i) Solid-e.g. soil, sand, copper metal, bucket, ice.
(ii)Liquid- e.g. water, petrol, ethanol/alcohol, mercury (liquid metal).
(iii) Gas- e.g. oxygen, nitrogen ,water vapour.
A solid is made up of particles which are very closely packed. It thus has a definite/fixed shape and fixed/definite volume /occupies definite space. It has a very high density.
A liquid is made up of particles which have some degree of freedom. It thus has no definite/fixed shape. It takes the shape of the container it is put. A liquid has fixed/definite volume/occupies definite space.
A gas is made up of particles free from each other. It thus has no definite/fixed shape. It takes the shape of the container it is put. It has no fixed/definite volume/occupies every space in a container.