最佳答案:在标准大气压下,冷却至-209.86℃时,液态氮变成雪状的固体.
最佳答案:PV = nRT → P = nRT/V = (nR/V)*TP2/P1 = T2/T1所以,P2 = P1 * T2/T1 = 40 * (273.15 +