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PRACTICAL 06:
To draw a Graph between volume and height of the water in a graduated cylinder.
APPARATUS:
- Graduated cylinder
- Beaker
- Dropper Or Pipette
- Scale
- Water
- Rubber band
THEORY:
The volume of a liquid in a graduated cylinder is directly proportional to the height of the liquid, therefore the ratio between height and volume is constant and graph between them will be a straight line.
MATHEMATICALLY:
V ∝ h
V = (constant) h
V/ h = constant
GRADUATED CYLINDER:
It is a cylinder of uniform diameter calibrated in millimetre or centimetre.
VOLUME:
Space occupied by a body is called volume. In S.I. system its unit is m3 and in C.G.S system its unit is cm-3 or ml.
FORMULA:
V = πr-3h
METHOD: (2 Marks)
- Rinse the cylinder with water so that no dust particles remain in it.
- Fix the scale vertically with the wall of cylinder such that its zero coincide with 10 ml. mark of cylinder.
- Slowly pour water into cylinder such that the lower meniscus of water coincide with 20 ml. mark.
- Note down height of water.
- Add more water in the cylinder and take five readings of volume and corresponding height of volume.
OBSERVATION:
No. | VOLUME OF WATER (V) ml |
HEIGHT OF WATER (h) cm |
V/h ml /cm |
---|---|---|---|
1. | 20 | ||
2. | 30 | ||
3. | 40 | ||
4. | 50 | ||
5. | 60 |
GRAPH: (3 MARKS)
- Draw x and y-axis on the graph paper. Take Volume 'V' on x-axis and Length 'h' is on y-axis.
- Supply suitable scale.
- Plot values of 'V' and 'h' from observation column.
- Draw line, which join those points.
(Note: This is a sample graph with assuming readings. The graph should be in a straight line if correct readings are obtained.)
FIGURE: (1 Marks)
RESULT: (0.5 Marks)
Since ratio between "V" and "h" is constant and graph between V and h is a straight line therefore volume and height are directly proportional to each other.
PRECAUTIONS:
- Cylinder must be rinsed before use.
- Attach scale vertically with cylinder.
- Cylinder must be placed on the horizontal surface.
- There should be no air bubble in the cylinder.
Special Thanks to Sir Sajjad Akber Chandio
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