Expansion 4 : The ratio of volume of foam formed to the volume of solution used to generate the foam; for ex-ample, an 8 expansion means 800 gallons of foam from 100 gallons of solution
National Foam, A Firefighter's Guide to Foam (Foam Glossary), Kidde Fire Fighting, Exton, PA, USA 2008. http://www.zurichservices.com/zsc/pptlibrary.nsf/c e835d312fec922c862568010078a415/1808b7dc16b70efc06 25687f001364cf/$FILE/Firefighters%20Guide%20to%20F oam%20(National%20Foam).pdf, (Fom - Amer) {143}