Yeah Samm. It is endothermic. And admittedly it was kind of a trick question. So, I had this 5th grade teacher come to me and said: “We can’t teach this kid anything more, can you do something for him.” He was nine years old. So I said bring him up. He came with his mom and the books he was reading, which were about relativity. So I asked the kid, suppose you have two lead boxes on an equal-arm balance and and the arm was horizontal. Suppose you could heat up one of the lead boxes. Would the arm stay balanced, would it go down, or would it go up?
Would would you say?
He said that the heated box pan would go down. I asked him why. He said that heat translates to motion, and that relative motion increases mass. It was a relativistic argument. He was right.
Only one of two geniuses I’ve taught in 31 years,