硫酸（化學式：H2SO4），硫的最重要的含氧酸。無水硫酸為無色油狀液體，10.36℃時結晶，通常使用的是它的各種不同濃度的水溶液，用塔式法和接觸法制取。前者所得為粗制稀硫酸，質量分數一般在75%左右；后者可得質量分數98.3%的濃硫酸，沸點338℃，相對密度1.84。

中文名     硫酸                                                                           外文名 Sulfuric acid

分子式   H?SO?                                                                     分子量  98.078

標況狀態    透明無色無臭液體                                                密    度    1.8305 g/cm3

熔    點     10.371 ℃                                                                  沸    點  337 ℃

溶解度    與水任意比互溶                                                        蒸汽壓     6×10?? mmHg

動態粘滯度     0.021 Pa s (25℃)                                               表面張力    0.0735 N/m

折射率     1.41827                                                                      熱容量      1.416 J/(g K) (STP)

汽化熱           0.57 kJ/g (STP)                                                     熔化熱     0.1092 kJ/g (STP)

CAS登記號      7664-93-9