1, mild: generally dizziness, headache, muscle weakness, general weakness and other discomfort.

2, moderate: dizziness will fall to the ground; Chest tightness, unbearable pain in nasal cavity and throat, shortness of breath, oppression and suffocation in chest; Severe headache, tinnitus, muscle weakness, skin redness, elevated blood pressure, and rapid and strong pulse.

3, severe: sudden dizziness can not support and fall to the ground, hold your breath, dyspnea, palpitation, unconsciousness, coma, blue skin, blue lips and nails, blood pressure drop, weak pulse can not be touched, dilated pupils. The light reflex disappears, the whole body becomes soft, the glottis increases, and the breathing and heartbeat stop one after another, leading to death. After the acute phase, some of them may have symptoms such as drowsiness and memory loss.

Extended data

Solid carbon dioxide is widely used in the refrigeration of perishable foods such as dairy products, meat and frozen foods in transit, and as a refrigerant in many industrial processes, such as crushing heat-sensitive materials, rubber polishing, metal cold treatment, shrink assembly of mechanical parts, vacuum cold traps and so on.

Gaseous carbon dioxide is used as a diluent for carbonated soft drinks, pH control in water treatment, chemical processing, food preservation, inert protection in chemical and food processing, welding gas, plant growth stimulator, hardening molds and cores in casting, pneumatic devices and disinfection gas.

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