Physics Practicals - For Class IX and X (Science Group) - PRACTICAL 04(X) 05(IX): Find the Specific Gravity of a body heavier than water by Archimedes principle.

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PRACTICAL 04(X) 05(IX):

Find the Specific Gravity of a body heavier than water by Archimedes principle.

APPARATUS:

• Physical balance
• Weight box
• Insoluble solid
• Beaker
• Water
• Bench
• Thread

THEORY:
ARCHIMEDES'S PRINCIPLE:
When a body is partially or wholly immersed in a liquid, due to upthrust it appears to lose some of its weight. The loss in weight of !he body is equal to the weigh of the liquid displaced.

SPECIFIC GRAVITY OR RELATIVE DENSITY:
It is the ratio of density of the substance to the density of water at 4 °C.

METHOD: (2 Marks)

• Adjust the balance with the help of adjusting and leveling screw.
• Suspend the bob in left-hand pan with thread.
• Find the weight of bob in air.
• Place a wooden bridge across left pan and place a beaker containing water.
• Find Weight of bob in water such that it does not touches the side wall of beaker. Bob should remain in water when beam is raised.

OBSERVATIONS: (5 Marks)

OBS.	WEIGHT OF SOLID IN AIR W1 (gm-wt)	WEIGHT OF SOLID IN WATER W2 (gm-wt)	LOSS OF WEIGHT OF SOLID IN WATER W1 - W2 (gm-wt)

CALCULATIONS:
FORMULA (1 Mark)

Specific gravity = ----------------- = --------------------

RESULT:
Specific gravity of given solid is found to be = ----------

FIGURE: (2 Mark)

PRECAUTIONS:

• Physical balance must be adjusted.
• Pan must not touch the wooden bench.
• Use foreceps to take weights from the weight box.

Special Thanks to Sir Sajjad Akber Chandio