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Unformatted text preview: its heat energy to something else. This would allow it to cool down and will cause the other object to warm up. 7. Who discovered the Law of Conservation of Energy? James Prescott Joule 8. What material did Lindys cooling system utilize? He only used air 9. Which gas is the most difficult to liquefy? Hydrogen 10. Who was the first person to liquefy hydrogen? James Dewar 11. What gas has the lowest liquification temperature of all? Helium gas 12. At what temperature does helium liquefy? 4K...
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