Recording the Wavelengths of the Light (IMAGE) University of Bonn Caption Prof. Martin Weitz's team at the Institute of Applied Physics of the University of Bonn has measured the temperature of a gas of light, when it condenses. The thermometer should be understood only figuratively, because, the temperature was determined by recording the wavelengths of the light. Credit © Image: Tobias Damm Usage Restrictions This photo may be used with the press release. 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.