Everything in the world is made of matter: mountains,
our body, a pen, water, the air.... A pen and water are different because they
are different types of matter. Each type of matter is called a substance.
PROPERTIES OF MATTER
MASS : An object’s mass is how much matter it has. For example, a notebook has more mass than a pen.
To find
an object’s mass we have to weigh it. Mass is expressed in various units, such
as in grams and kilograms.
