A graph for an ideal gas at constant volume is plotted by taking pressure along y - axis and centigrade temperature along x - axis as shown in the figure below. Find the x intercept of the graph.
A
−273.15∘C
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B
−273.15K
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C
−273∘C
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D
−273K
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Solution
The correct option is A−273.15∘C For an ideal gas at constant volume, pressure of a gas is proportional to the temperature i.e P∝T The pressure of a gas in (Nm2) becomes zero when the temperature (in Kelvin scale) becomes zero. From the relation between Kelvin and Celsius scale, C=K−273.15 We can conclude that, the x-intercept of the graph (when pressure is equal to zero) is −273.15∘C