Physics Practicals - For Class IX (Science Group) - PRACTICAL 06: To draw a Graph between volume and height of the water in a graduated cylinder.

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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)

1. Rinse the cylinder with water so that no dust particles remain in it.
2. Fix the scale vertically with the wall of cylinder such that its zero coincide with 10 ml. mark of cylinder.
3. Slowly pour water into cylinder such that the lower meniscus of water coincide with 20 ml. mark.
4. Note down height of water.
5. 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