Consider the heating of CO2 or H20 gases across a shock wave. Assume that the vi
ID: 2305618 • Letter: C
Question
Consider the heating of CO2 or H20 gases across a shock wave. Assume that the vibrational relaxation times are sufficiently long that relaxation effects can be observed for both gases. (i) Sketch how the temperature will vary along the dashed line shown for each gas. (Note, you are to draw a sketch, not give a numerical solution; however, your sketches should show qualitative differences between the two gases.) shock CO2 or H20 gas (300 K) M1-5 (??) At room temperature the ratio of specific heats ? for CH4 is 1.3 l and for CF4 it is 1.16. olecules, which have the ofy at room temperature.Explanation / Answer
a) the response between temperature and distance in terms of motion of CO2, would be in direct relation with each other.i.e., for small changes in temperature the behaviour of CO2 also change in ccordance with the temperature but it will not be alinear response instead an non-linear direct relation between temperature and CO2 exists.
now with repect to H2O will be an inverse relation between hem. here one should know that H2O can be treated as a dipole in which an hyderogen and an hydroxyl ions are separated by certain fixed distance. if x in the graph represnts such distance then that distance is always constant as long as the internal energy of H2O is not dominated by the external energy. but ones the supplied energy is increased and goes beyond the hydrogen and hydroxyl then the temperature increase also increases the distance between them. therefore the graph response is a linear decreament...
b) in the question gaama(symbol) represents the ratio of specific heats at constant pressure and specific heat at constant volume. so one should relate that the specific heat at constant volume totally depends on INTRNAL ENERGY changing withrespect to temperature,which will be different for different compositions. and specific heat at constnt presure is much related to ENTHALAPY,which is also about internal energu where effect of pressure is not condidered . therefore it clearly depicts that though the number of atoms may be same, the behavious with respect to pressure and volumes change ,due to which they possess different values