二十摄氏度时空气密度 空气密度=1.293*(实际压力/标准物理大气压)*(273.15/实际绝对温度)，绝对温度=摄氏温度+273.15通常情况下，即20摄氏度时，取1.205kg/m3。
铜在20摄氏度时的密度比0摄氏度时要
水的密度 水在不同温度下的密度、粘度、介电常数和离子积常数Kw值Densities，Viscosities，Dielectric Constants and Ionic Product Constants of Water at Different Temperatures温度t(Temperature)/0C密度ρ(Density)(g/ml)黏度η(Viscosity)(10-3Pa·s)介电常数ε(Dielectric constant)/(F/m)离子积常数(Ionic product constant)Kw00.9998487.900.11×10-1420.9999440.9999750.9999651.518885.900.17×10-1460.9999480.99985100.9997001.309783.950.30×10-14120.99950140.99924150.9990991.144782.040.46×10-14160.998940.50×10-14170.55×10-14180.998600.60×10-14190.65×10-14200.9982031.008780.180.69×10-14210.76×10-14220.997770.81×10-14230.87×10-14240.997300.93×10-14250.9970440.894978.361.00×10-14260.996781.10×10-14271.17×10-14280.996231.29×10-14291.38×10-14300.9956460.800476.581.48×10-14311.58×10-14320.995031.70×10-14331.82×10-14340.994371.95×10-14350.994030.720874.852.09×10-14360.993692.24×10-14372.40×10-14。
