The graph in the left shows the different possible states of matter. There are two ways to get from a liquid to a gaseous state. The first method involves increasing the temperature while holding the pressure steady, as indicated by the arrow with the broken line . This method is commonly used in everyday settings—to boil water and convert it to steam, for example. Heating a liquid takes time, however, which makes rapid vaporization difficult. On the other hand, one can also heat the liquid in advance and then abruptly reduce the pressure, as illustrated by the arrow with the solid line . The pressure in the vaporization section of the injector can be reduced instantaneously, and this makes it possible to vaporize a liquid source instantaneously.