Page 55 - Science Class 06

Another important feature about nature of can change their shapes as well, when put
ma er is that it is made up of par cles. into new containers.

As for gases, their par cles are even loose
and wide apart. So, gases can flow just like

Take a piece of rock-salt. Put it into a liquids and can change their shapes too.
mortar and break it into two pieces using PROPERTIES OF MATTER
a pestle. Go on using the pestle ll you
Having learnt various facts regarding the
get the sand-like grains of the rock-salt.
nature of ma er, we must study some of its

To begin with, the piece of rock-salt was important physical proper es. These
ma er as a big lump. But we used a pestle to proper es are, in fact, its various features.
break this piece into smaller parts. These They include solubility, heaviness, trans-
parts were also ma er. One further pounding, parency, diffusion and its behaviours
we got grains of salt that are also ma er. towards heat, electricity and magnets. Let
us study these proper es of ma er one-by-
The grains of salt are called par cles. Every
one in detail.
form of ma er is made of par cles. That is
why we say that all ma er is par culate. Solubility in Water
This theory was first of all pronounced by A liquid that allows other materials to
an Indian saint, named Kanaad who was in dissolve in it is called solvent and a liquid

the line of sage Kashyap. It was this theory containing a dissolved material is called
of kanas (par cles) that got him the solu on. Water is a universal solvent and it
nickname kanaad. is also one of the primary basic needs of all
Remember that the par cles of a solid are living beings. It helps the internal transport

much closer to one another. So, solids do of the body and we use it for various other
not change their shapes easily. But in a purposes in day-to-day life. These ac vi es
liquid, these par cles are only close enough include cooking, cleaning, washing and
to stay together. So, liquids can flow and irriga on. Water can dissolve a large
number of materials in it.

1. What are different forms of ma er?

2. Write the name of three solid objects and their shapes.
3. Why does ma er change its physical forms?

Aim : Test for solubility.

Procedure : Take seven glass tumblers and fill each of them with water up to three-
fourth of it. Now, take small amount of salt, sugar, sand, potassium permanganate and

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