I'm no scholar. but science is always fascinated and intrigued me but from time to time i like to think or try to think with the same understanding as some of the brightest minds in existence. any way. instead of tinkling of gravity as a force treat it like pressure is without fluid. it makes sense in my brain. if i'm way off explain what data i am ignorant of . you. jason

On a mild saturday morning while people are working inside, the furnace keeps the temperature inside the building at 23degreesc. at noon the furnace is turned off, and the people go home. the temperature outside is a constant 16degreesc for the rest of the afternoon. if the time constant for the building is 3 hr, when will the temperature inside the building reach 18degreesc? if some windows are left open and the time constant drops to 2 hr, when will the temperature inside reach 18degreesc?