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the volume of irregular solid body = v2-v1=70-30=40…cm3……………….
2-A calculate volum of cuboids which length is 5 cm

,width is 2 cm, height 3 cm

Volume =…………5x2x3

=…………………30cm3…………………..
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3-Graduated cylinder containing 100 cm of water when an irregular
stone put in it the water level become 110 find the volume of stone.

The volume of stone=V2-V1=110-100=10cm3.

Lesson 2

Matter states and its changes

-Matter exists in three states.

-States of matter are solid, liquid and gaseous.
-Matter consists of small building units called molecules or particles.

Solid :

it has a definite shape and volume .

Example : iron , stone , and ice .
* Liquid : - it has a indefinite shape and definite volume .

( take the shape of their container )

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