Question
How will you determine the density of a stone using a measuring jar?
✓
Answer
1. In order to determine the density of a solid, we must know the mass and volume of the stone.
2. The mass of the stone is determined by a physical balance very accurately. Let it be ' $m$ ' grams.
3. In order to find the volume, take a measuring cylinder and pour in it some water.
4. Record the volume of water from the graduations marked on measuring cylinder. Let it be $40 cm^3$.
5. Now tie the given stone to a fine thread and lower it gently in the measuring cylinder, such that it is completely immersed in water.
6. Record the new level of water. Let it be $60 cm^3$
$\therefore$ Volume of the solid $=(60-40) cm ^3$
$=20 cm^3= V cm ^3$ (assume)
Knowing the mass and the volume of the stone, the density can be calculate by the formula :
Density $=\frac{\text { mass }}{\text { volume }}=\frac{m}{v} g / cm 3$
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