| NERNST | German physicist who developed the third law of thermodynamics |
| GEIGER | German physicist who developed the Geiger counter (1882-1945). |
| HANSGEIGER | German physicist who developed an instrument for detecting radiation (4,6) |
| RUDOLFCLAUSIUS | German physicist who formulated the second law of thermodynamics (1850) and coined the term entropy (6,8) |
| HUYGENS | Physicist who developed the wave theory of light, described the shape of Saturns rings and discovered Titan (7) |
| EINSTEIN | Albert, German-born physicist who developed the theory of relativity (8) |
| ENTROPY | Subject of the second law of thermodynamics |
| MAXWELLSDEMON | *Theoretical being who violates the second law of thermodynamics |
| JOULE | Physicist James who contributed to the laws of thermodynamics |
| VOLTA | Alessandro ___, Italian physicist who developed the first electrochemical cell (5) |
| ENERGY | According to the first law of thermodynamics, property of matter that can neither be created nor des |
| PERPETUALMOTION | Violation of the first and second laws of thermodynamics |
| WATSONWATT | Depicted in Castles in the Sky, physicist who developed a radar that was pivotal in the allied victory of the Battle of Britain (6-4) |
| THRUST | Propulsive property, as of a jet or rocket engine, explained by Newton's third law of motion (6) |
| HESS | Russian chemist with a law of thermodynamics named after him |
| WEBER | One of the founders of modern sociology; or, the German physicist who invented the electromagnetic telegraph with his friend Carl Friedrich Gauss (5) |
| EQUAL | "To every action there is always opposed an - reaction", according to Newton's third law of motion (5) |
| FOUR | How many laws of thermodynamics are there? (4) |
| ROENTGEN | German physicist who discovered x-rays and who has the unit of radiation exposure named after him (8) |
| FAHRENHEIT | Temperature scale named after the German physicist who invented the mercury thermometer |
