Physical Science

1. WELCOME

2. Topic:water

3. What is water
 H2O) is the most abundant compound on Earth's surface,
covering 70 percent of the planet. In nature, waterexists in
liquid, solid, and gaseous states. It is in dynamic
equilibrium between the liquid and gas states at standard
temperature and pressure. At room temperature, it is
a tasteless and odorless liquid, nearly colorless with a hint
of blue. Many substances dissolve in water and it is
commonly referred to as the universal solvent. Because of
this, water in nature and in use is rarely pure and some
properties may vary from those of the pure substance.
However, there are also many compounds that are
essentially, if not completely, insoluble in water. Water is
the only common substance found naturally in all three

4. Use of water in daily life
 For drinking
 For washing
 For bathing
 For cooking

5. Properties of water
 Water has three states. Below freezing water is a solid (ice or
snowflakes), between freezing and boiling water is a liquid, and above
its boiling point water is a gas. There are words scientists use to
describe water changing from one state to another. Water changing
from solid to liquid is said to be melting. When it changes from liquid
to gas it is evaporating. Water changing from gas to liquid is called
condensation (An example is the 'dew' that forms on the outside of a
glass of cold soda). Frost formation is when water changes from gas
directly to solid form. When water changes directly from solid to gas
the process is called sublimation.
2.Most liquids contract (get smaller) when they get colder. Water is
different. Water contracts until it reaches 4 C then it expands until it is
solid. Solid water is less dense that liquid water because of this. If
water worked like other liquids, then there would be no such thing as
an ice berg, the ice in your soft drink would sink to the bottom of the

6. Physical properties of water
 Freezing point
 Melting point
 Boiling point

7. Freesing point of water
 The temperature at which a liquid freezes:
The freezing point of water is 32°F, 0°C.

8. Melting point of water
 The melting point of water is the point at
which ice changes into liquid water. .
 The melting point of water is not always
the same as the freezing point of water!

9. Boiling point of water
 The temperature at which the water boils is
called boiling point
 Boiling point of water is 100 degree celsius

10. THANK YOU
Submitted by,
Agnes Alphonsa C.A
Physical science