Volume

All you need to know about VOLUME...

What is volume?
The volume of an object is the amount of space it occupies.

Apparatus used for volume measurement:

-beaker

-measuring flask

-burette

-pipette

-measuring cylinder

S.I. Unit:cubic metre(m3)

Other units:

-cubic kilometre(km3) -cubic centimetre(cm3)
-cubic millimetre (mm3)

Accuracy of:

measuring cylinder-1cm3

burette-0.1cm3

pipette-fixed volume of 25cm3 or 50cm3

measuring flask-fixed volume of 250cm3 or 500cm3.

Meniscus reading:

The menicus of most liquids curve downwards.correct way of reading it:

- to position the eye at the same level as the meniscus

-mark correspoding to the bottom of the meniscus is taken as the reading

-The meniscus of mercury curve upwards.

-Reading the meniscus correctly minimise parallax error.

Measuring the volume of irregular-shaped objects
Small irregular-shaped objects

- fill a measuring cylinder with water and record the initial volume, V0cm3

- immerse the object into the measuring cylinder gently so that it is completely covered with water. Record the
new volume, V1cm3

-The volume of the object is the difference
between the two volumes recorded.

Large irregular-shaped object

-fill the displacement can with water

-Remove the beaker when the water stops flowing.

-place an empty
measuring cylinder below the spout of the displacement can.

-immerse the object
into the displacement can gently so that it is completely covered with
water.

- when the water stops
flowing into the measuring cylinder, observe and record the volume of water
displaced by the object and collected in the measuring cylinder.

- the object
should not dissolve in the liquid.
We can use formulae to measure the volume of regularly shaped solids

Formulae to find the volume of regular-shape objects:
cube: V= l3
cuboid: V= lbh
cylinder: V= pi'r2h
cone: V=1/3pi'r2h
sphere: V=4/3pi'r3

Conversions
1km3
=(1000x1000x1000)m3
=1000000m3

1m3(SI Unit)
=(100x100x100)cm3
=1000000cm3
=1000L

1cm3
=(10x10x10)mm3
=1000mm3
=1mL

1mm= -

Done by: Group3,
Lee Zuo Qi,Rachel Tsang and Simone Lam,
106
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