Practical No. 11: Determination of pressure-volume relation using Boyle’s law.
XIII. Interpretation of Results
- The product of pressure and volume (P × V) was found to be approximately constant for each observation. The graph of P vs. 1/V was a straight line passing through the origin.
XIV. Conclusions and Recommendations
- It is concluded that Boyle’s law is verified for the enclosed air at constant temperature.
- It is recommended to ensure that the temperature remains constant throughout the experiment by not handling the tube excessively and taking readings promptly.
XV. Practical Related Questions & Answers
Q1. State the new volume of the gas if the pressure on 350 cm³ of oxygen at 720 mm Hg is decreased to 600 mm Hg?
- Answer:
- Formula: According to Boyle’s Law, P1 × V1 = P2 × V2
- Given Data: P1 = 720 mm Hg, V1 = 350 cm³, P2 = 600 mm Hg
- Calculation:
- V2 = (P1 × V1) / P2
- V2 = (720 × 350) / 600
- V2 = 252000 / 600
- V2 = 420 cm³
Q2. Can we measure the atmospheric pressure using Boyle’s law apparatus?
- Answer: Yes, indirectly. When the levels of mercury in both limbs are equal, the pressure on the trapped air is equal to the atmospheric pressure (H). This value of H can be read from the barometer provided with the apparatus.
Q3. Give the name of gas enclosed in closed tube.
- Answer: The gas enclosed in the closed tube is air.
Q4. State the Boyle’s law.
- Answer: Boyle’s law states that for a fixed mass of an ideal gas at constant temperature, the pressure of the gas is inversely proportional to its volume.
- Mathematical expression: P ∝ 1/V or PV = constant.
Q5. Write two examples of Boyle’s law.
- Answer:
- Example 1: Inhaling and exhaling (lungs expand, pressure decreases allowing air to flow in; lungs contract, pressure increases forcing air out).
- Example 2: A syringe (pulling the plunger increases volume, decreasing pressure, drawing fluid in).
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