Formic acid can cause combustion and explosion when exposed to open flame and high heat. Strong oxidant, strong alkali and active metal powder. High concentrations of formic acid tend to freeze in winter. The molecular composition of formic acid is insoluble in hydrocarbons and is bound by hydrogen bonds. The critical temperature is 306.8. It can react with strong oxidants.

易燃。可与水、乙醇、乙醚和甘油自由混溶，可与大多数极性有机溶剂混溶，并可溶于烃类。

Flammable. It is free miscible with water, ethanol, ether and glycerin, miscible with most polar organic solvents, and soluble in hydrocarbons.

相对密度(d204)为1.220。折射率是1.3714。燃烧热为254.4kJ/mol，临界温度为306.8，临界压力为8.63MPa.闪点68.9(开杯)。密度为1.22，相对蒸汽密度为1.59(空气=1)，饱和蒸汽压(24)为5.33 kPa。

The relative density (d204) was 1.220. The refractive index is 1.3714. The combustion heat is 254.4 kJ / mol, the critical temperature is 306.8, the critical pressure is 8.63 MPa, and the flash point is 68.9 (open cup). The density is 1.22, the relative vapor density is 1.59 (air = 1), and the saturated vapor pressure (24) is 5.33 kPa.

高浓度的甲酸在冬天容易结冰。

High concentrations of formic acid tend to freeze in winter.

禁用化合物：强氧化剂、强碱和活性金属粉末。

Prohibited compounds: strong oxidant, strong base and active metal powder.

危险特性：其蒸气和空气形成爆炸性混合物，暴露在明火和高热下可引起燃烧和爆炸。它能与强氧化剂反应。

Hazard characteristics: its vapor and air form an explosive mixture, which can cause combustion and explosion when exposed to open fire and high heat. It can react with strong oxidants.

溶解性：与水混溶，不溶于烃，与醇混溶。

Solubility: miscible with water, insoluble in hydrocarbon and miscible with alcohol.

在烃类和气态中，甲酸通过氢键以二聚体的形式出现。气态时，氢键导致甲酸气体与理想气体状态方程有较大偏差。液体和固体甲酸由通过氢键结合的连续甲酸分子组成。

In hydrocarbons and gases, formic acid appears as dimers through hydrogen bonds. In the gaseous state, hydrogen bonding leads to a large deviation between formic acid gas and ideal gas equation of state. Liquid and solid formic acids consist of continuous molecules of formic acid bound by hydrogen bonds.

这些是甲酸的物理化学性质。明火和高热引起的燃烧和爆炸。甲酸以氢键结合的二聚体形式出现在烃中，具有溶解性。

These are the physicochemical properties of formic acid. Burning and explosion caused by open fire and high heat. Formic acid occurs in hydrocarbons in the form of hydrogen bonded dimers and is soluble.