1, liquid surface tension: about 3.0 Dyn/cm；;

2. Density:1.816 kg/m3;

3. Viscosity: 0.064 MPa·S；; ;

4. Critical temperature: 365438 0.06℃;

5. Critical pressure: 7.383MPa；;

6. Critical volume: 10.6Kmol/m3.

Second, the chemical properties of carbon dioxide

1, reacting with water: carbon dioxide can be dissolved in water and reacts with water to generate carbonic acid, while unstable carbonic acid is easily decomposed into water and carbon dioxide.

2. Reaction with alkaline substances: carbon dioxide can react with calcium hydroxide to generate calcium carbonate precipitate and water.

3. Reaction with active metals under fire conditions: Carbon dioxide itself does not support combustion, but it will react with some active metals (such as sodium, potassium and magnesium) under fire conditions to generate corresponding metal oxides and carbon.

4. Compatibility contraindications: Although carbon dioxide can react violently with various metal oxides or reducing metals, such as aluminum, magnesium, titanium and zirconium, it can be compatible with most substances. The mixture containing sodium and potassium will explode when shaken.

Extended data:

In a certain range, the higher the concentration of carbon dioxide, the stronger the photosynthesis of plants, so carbon dioxide is the best gas fertilizer. On a farm in New Jersey, American scientists have done a lot of experimental research on different crops at different growth stages with carbon dioxide. They found that carbon dioxide is most effective when used in the vigorous growth and maturity of crops.

The density of carbon dioxide is higher than that of air. It is harmless to the human body when it is small, but it will affect the breathing of people (and other creatures) when it exceeds a certain amount, because the concentration of carbonic acid in the blood increases and the acidity increases, resulting in acidosis. When the volume fraction of carbon dioxide in the air is 1%, I feel sultry, dizzy and palpitation; 4%-5% will feel dizzy. More than 6% will make people lose consciousness and gradually stop breathing and die.

3. Solid carbon dioxide is also called dry ice after compression. Dry ice sublimates at MINUS 75℃, which can absorb the surrounding heat and condense the surrounding water vapor, thus creating a misty scene and the surrounding temperature dropping rapidly. Therefore, dry ice is often used to store items at low temperature.

References:

Baidu Encyclopedia _ CO2