Page 93 - Physics

Density and relative density

Relative density of a solid

Acti vity 4.6

Aim: To fi nd the relative density of a solid material
Materials: Eureka can, measuring cylinder, stone, beam balance, water, string,
beaker

String
Eureka Spout
can Spout
Displaced
Water water
Water
Beaker Stone Beaker

(a) (b)
Figure 4.7
Procedure
1. Find the mass, m of the solid by using a beam balance.
0
2. Place an empty dry beaker of mass m under the spout of the eureka can, as shown
1
in Figure 4.7 (a).
3. Fill the eureka can with water until it just begins to overfl ow, as shown in Figure
4.7 (a).
4. Lower gently the solid into the water with the help of a thin string until it is
completely immersed, as shown in Figure 4.7 (b).
5. Let the water overfl ow into the beaker under the spout. Measure the mass of
beaker containing the overfl ow water. Call this m .
2
Results
Mass of a solid = m 0

Mass of dry empty beaker = m 1

Mass of beaker and water = m 2

Mass of equal
(
volume of water = m - m )g
1
2
Mass of substance
Relative density =
Mass of equal volume of water

= m 0 .
m −m
2 1

87

Physics Form 1 Final.indd 87 16/10/2024 20:56