把一些热水注入一支试管中,跟著用手指按著管口,然後把试管放在自来水下冲一会。最後试管? gas law: pv = nrt when hot p(hot)=nrt(hot)/v when cold p(cold)= nrt(cold)/v t(hot) t(cold) p(hot)- p(cold) = (nr/v )(t hot - t cold) 0 so pressure decrease after putting it under running water when the pressure * area of the testube is greater than the weight of the testube and water the tube will not fall 查看更多