Water/Saline Solution Being Heated (image) NASA/Johnson Space Center Caption This shows images of water/saline solution being heated. The temperature and pressure increases through the critical point until there is no distinction between water's liquid and vapor phase. This is evidenced by the disappearance of the thin black line that separates the phases. Credit Image Credit: NASA Usage Restrictions with credit Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.