Thermodynamics isue... not homework but debate.... Hi, i have visited the forum for an explanation in cuantum theories (curious) and now i need other help. In my school (in Chile, we speak spanish, forgive my english, please), my teacher gave a test, im really good at physics but this time i got wrong an answer that i think that is wrigh, post your opinions and give VALID answers, not just a yes, maybe mathematical answers would be better. the problem is this If you leave a baloon exposed to the sun, ¿what will happen? (Really easy so far, right) -My teacher says that it will explote (¡¡¡ NO WAY¡¡¡, really??') because of the presure increase. -I say it will explote because of the volume increase. This are my argumens -When you say something (in cience) you have to make an hipothesis, to make a theory you have to reduce (or eliminate) any other variable or noise (Right). So far so good.... so i started to think, the sun heats the balloon, that makes presure increase that makes volume increase that makes the ballon explote.... so the presure is linked to the volume (in the baloon) . -To eliminate all variables i simulated 3 experiments 1--Volume variable (all constants) 2--Presure variable (all constants) 3--Temperature variable (all constants) In 1--Volume variable i give the next "hipothetical" scenario: -In order to preserve presure and temperature constant i will decrease the "outside baloon" presure, so the presure differences will make the ballon expand without changing inside presure (At least in very little) nor temperature.... (in theory) what im doing is to expand the baloon, Will it explode at some point??....YES. In 2--Presure variable i give the next "hipothetical" scenario: -In order to preserve volume and temperature constant i will increase the "outside baloon" presure, and at the same time increase the "inside baloon" presure (either with magic or adding more gas) so the presure differences is 0 that will make the ballon to increase (inside) presure without changing volume nor temperature.... (in theory) Will it explode at some point??....NO.... because the presure inside and outside will eliminate each other (First law of Newton). In 3--Temperature variable i give the next "hipothetical" scenario: -Honestly, i tried to think this one, and i just couldnt figure it out.... SO what do you think??, my teacher is right or i am right, because if you thing about it, in all cases, volume is what makes a baloon explode, right?? PS: A tie is also allowed, that means say that neither the presure nor the volume is what cause the baloon to explote, that means saying that BOTH are linked so both answers are right.