Vapor Pressure Illustration (VIDEO) DOE/Pacific Northwest National Laboratory This video is under embargo. Please login to access this video. Caption Many materials used in explosives are hard to detect through the air because they release few molecules. That’s in contrast to materials like gasoline, which evaporates quickly. Credit Animation by Sara Levine | Pacific Northwest National Laboratory Usage Restrictions Please use credit info. License Original content 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.