First slide

Thermometry

Question

For one mole of an ideal gas, the temperature of the gas expressed in centigrade scale is plotted on the X - axis and the product “PV” is plotted on the Y - axis. The graph is

Moderate

A

a straight line not passing through the origin
B

a straight line passing through the origin
C

a rectangular hyperbola
D

a straight line parallel to the X - axis

Solution

$PV = nTR, PV = y and T - 273 = x$ . This gives $y = nRx + 273 nR$ and this is like $y = mx + c$ which is a straight line not passing through the origin

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