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According to its physical state gas liquid and solid and according to its composition element compound or mixture
The four classification of matter is
1. solid -compact molecules, has definite shape and volume
2.liquid-molecules are apart, has indefinite shape but definite volume
3.gas- molecules are far from each other, indefinite shape and volume
4.plasma (newly discovered)
matter can be identified by its characteristics inertial and gravitational mass and the space that it occupies, 2.matter is anything that occupies space and its has mass, 3.matter makes up the air we breathe the ground we walk on and many othermore