Hydrogen Concentrations in a 5 Knot Wind (IMAGE) DOE/Sandia National Laboratories Caption In case of an accidental release of the hydrogen from its storage tank, modeling can show how long a flammable plume of gas will last and the shape of the plume with various wind speeds. This image shows the hydrogen concentrations in a 5 knot wind, with the flammable region in white. Credit Sandia National Laboratories Usage Restrictions None License Licensed 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.