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Question
Describe an experiment to determine the density of the material of a coin.
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Solution
The density of the material of a coin is determined by the following experiment:
- We know density is mass per unit volume. So, first mass of the coin is measured by a common beam balance. Let it be M gram.
- Volume of the coin is measured by a measuring cylinder as shown in the figure given below.
- Take a measuring cylinder and fill it partly with water.
- Note the level of water. Let it be V1 mL.
- Tie the coin with a thread and gently lower the coin inside the measuring cylinder. Take care that no water splashes out.
- Note the level of water again. Let it be V2 mL.
- Find the volume of the coin (V) by subtracting V1 from V2.
V = V2 - V1
Density of coin is calculated by the formula: Density = `"Mass"/"Volume"`
D = `"M"/"V" "g cm"^(-3)`
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