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According to Boyle's law, what remains constant when a fixed mass of gas is compressed at constant temperature?
AThe ratio of volume to number of moles (V/n)
BThe sum of pressure and volume (P + V)
CThe product of pressure and volume (PV)
DThe ratio of volume to temperature (V/T)
Answer & Solution
Correct answer: C. The product of pressure and volume (PV)
1. Boyle's law states $P \propto \dfrac{1}{V}$ at constant temperature for a fixed mass.
2. This means the product $PV$ stays constant.
3. So the conserved quantity is $PV$.
4. The ratio $V/T$ belongs to Charles's law and $V/n$ to Avogadro's law, so those are wrong.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 3 Thermal Physics "Boyle's Law", p.43_
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