Page 43 - Science and Technology Std 3

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Figure 3 shows a charcoal stove which boils water in a kettle.
The steam coming out of the kettle is cooled by a plate turning
FOR ONLINE USE ONLY
into water again.

Changes in states of water

Ice Water Gas

Figure 3 Changes in states of matter

Matter can be in solid, liquid and gaseous states. Matter
changes from one state to another. When ice warms, it melts
and turns into water. When water is heated, it boils and turns

into steam or gas. When steam cools, it turns into liquid. If
liquid is frozen, it turns into solid. Therefore, ice is in the solid
state. Water is in the liquid state and steam is in the gaseous
state.

Floating of objects

Some objects float on water. Things that float on water include
ships, boats and canoes. These have special features or shapes
that enable them to float.

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PROPERTY OF UNITED REPUBLIC OF TANZANIA GOVERNMENT
Ministry of Education, Science and Technology
Science and Technology 3.indd 36 03/08/2019 11:02