Solved Problems Example A container whose capacity is ml is filled with a liquid up to ml. Then, the liquid in the container is heated. Initially, the level of the liquid falls from ml to . ml.
Then we heat more, the level of the liquid rises to . ml. Find the apparent and real expansion. Thermal Physics Data: Level of the liquid L = ml Level of the liquid L = .
ml Level of the liquid L = . ml Apparent expansion = L − L = . ml – ml = .2ml Real expansion = L − L = . ml – .5ml = .7ml So, Real expansion > apparent expansion Example Keeping the temperature as constant, a gas is compressed four times of its initial pressure.
The volume of gas in the container changing from 20cc (V cc) to V cc. Find the final volume V . Data: Initial pressure (P )= P Final Pressure (P ) = 4P Initial volume (V ) = 20cc = 20cm Final volume (V ) = ? Using Boyle's Law, PV = constant P V = P V V = P P × V = P 4P × 20cm V = cm I.
Choose the correct answer . The value of universal gas constant a) . Jmol – K – b) . Jmol – K – c) .
Jmol – K – d) . Jmol – K – . If a substance is heated or cooled, the change in mass of that substance is a) positive b) negative c) zero d) none of the above . If a substance is heated or cooled, the linear expansion occurs along the axis of a) X or –X b) Y or –Y c) both (a) and (b) d) (a) or (b) .
Temperature is the average of the molecules of a substance