Generally speaking, no matter what substance, no matter what state it is in, the volume or density will change accordingly with the change of temperature and pressure. The relationship between temperature T, pressure P and density ρ (or volume) is called the equation of state. The volume of a gas varies significantly with the pressure it is subjected to and the temperature it is at. For an ideal gas, the equation of state is:
Where r is the gas constant, which is equal to 287. 14m2 (2* seconds). If its temperature is constant, the density is proportional to the pressure; If its pressure is constant, its density is inversely proportional to its temperature. For general gas, if the density is not large and the temperature is far from the liquefaction point, its volume changes with pressure close to the ideal gas; For high-density gases, the above equation of state should also be modified appropriately.
Extended data
Physical properties:
Liquid carbon dioxide, density1.101g/cm3, (-37℃);
When carbon dioxide is dissolved in water, the PH value in the water will decrease, which will do harm to the living things in the water.
Liquid carbon dioxide absorbs a lot of heat when it evaporates; When it releases a lot of heat, it will condense into solid carbon dioxide, commonly known as dry ice.
Precautions:
Operators must be specially trained and strictly abide by the operating procedures.
Lightly load and unload when handling, so as to prevent the cylinders and accessories from being damaged. Equipped with leakage emergency treatment equipment.
Equipped with a self-priming breathing mask.
Packaged gas cylinders have a service life, and all expired gas cylinders must be sent to relevant departments for safety inspection before they can be used again.
Bottled gas products should be classified and stacked during transportation, storage and use. Combustible gas and combustion-supporting gas should not be stacked together, nor should they be close to open flames and heat sources. Do not get close to fire, oil wax, explosion, re-throwing or impact. It is forbidden to strike an arc or arc on the gas cylinder, and it is forbidden to load and unload it rudely.
References:
Baidu encyclopedia-liquid carbon dioxide
References:
Baidu encyclopedia-density