In my book it’s written that “A rise in temperature is given a positive sign. So the value of H is negative for an exothermic reaction. A fall in temperature is given a negative sign. So the value of H is positive for an endothermic reaction.”
What I don’t understand is that why is sign of exothermic negative doesn’t exothermic rise temperature of sorrounding? And why is endothermic taken as positive doesn’t it take in energy and cool down the surrounding?