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        The pressure trajectories for an actual hydrogen cooled plasma core reactor will. differ quantitatively from those in Figure 12. This is to be expected since the critical mass will not remain constant over wide temperature variations, due to the temperatures dependence of hydrogen scattering and uranium resonance absorption as discussed in Chapter II. However, the application of pressure trajectories in determining the critical mass will still be valid when these two effects are included, and the general form of the trajectories in Figure 12 can be expected to be similar to those in the hydrogen cooled uranium plasma.