The 10-degree temperature on Thursday didn’t cool the enthusiasm of Great Bend High School Physics II students as they tested rockets they made in class. Using the field behind the District Education Center as a launch site, they huddled close in an open bus bay as they prepared the fuses and attempted to light them in strong icy winds. The rocket launch was the culmination of a two-week project designed to demonstrate the laws of thermodynamics, said their teacher, Jessica Nairn.“They learned how the first and second laws of thermodynamics apply to the fuel of a rocket,” Nairn said.