从图2.4可以看出，当压力固定且未达到超临界状态时，二氧化碳的比热容随

从图2.4可以看出，当压力固定且未达到超临界状态时，二氧化碳的比热容随着温 度的升高而减小，当其状态刚进入超临界条件时，比热容会发生较大的变化，从图中可 以看出在7.37Mpa、30.95℃条件下的比热容达到了极值，而高的比热容条件下，物质 的相态要发生变化则需要吸收更多的热量，因此在此状态下二氧化碳的管道输送更加稳定

It can be seen from Figure 2.4 that when the pressure is fixed and does not reach the supercritical state, the specific heat capacity of carbon dioxide decreases with the increase of temperature. When its state just enters the supercritical condition, the specific heat capacity will change greatly. It can be seen from the figure that the specific heat capacity at 7.37Mpa and 30.95 ℃ reaches the extreme value, while under the condition of high specific heat capacity, if the phase state of the substance changes, it needs to absorb more heat, Therefore, in this state, the pipeline transportation of carbon dioxide is more stable

As can be seen from Figure 2.4, when the pressure is fixed and does not reach the supercritical state, the specific heat capacity of carbon dioxide decreases with the increase of temperature. When the state just enters the supercritical state, the specific heat capacity will change greatly. From the figure, it can be seen that the specific heat capacity reaches the extreme value at 7.37Mpa and 30.95℃, while under the condition of high specific heat capacity, it is necessary to absorb more heat to change the phase state of the substance, so carbon dioxide needs to absorb more heat in this state.