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Many accidents are often unexpected and have the characteristics of accidental and suddenness.
Materialist dialectics believes that there is inevitability in contingency, and inevitability is expressed through a large amount of contingency.
Most accidents appear to be accidental on the surface, and are a kind of random and small probability event.
When an accident occurs, many people only see the superficial phenomenon and feel that it is purely an accident.
The relationship between inevitability and contingency is actually a causal relationship.
Case 1 Rare vacuum oil pump explosion
The vacuum oil pump in a certain laboratory burst at night when it was operating.
Figure 2-13 The steel plate at the bottom of the oil pump falls off and the oil is splashed
Figure 2-14 There should not be a large amount of black dirt inside the pump body
The explosion of the vacuum oil pump is an accident that shouldn't happen
(1) Regardless of the rules of use of electrical appliances, placing them in a pervasive corrosive environment will greatly shorten the service life, causing corrosion of the motor, short circuits, and flashovers, which may cause accidents
(2) For the sake of convenience and speed, the vacuum oil pump is used as a water-circulating vacuum pump.
(3) Cut corners and fail to assemble or assemble various basic absorption devices in accordance with regulations, and even forget to add refrigerants such as dry ice in the cold trap.
(4) The operation is extensive at ordinary times, and maintenance is not carried out in accordance with regulations
The above irregular behaviors are all inevitable factors that cause the pump body to explode.
Case 2-an accidental flushing accident
The oxidant used in this reaction is pyridinium chlorochromate (PCC), and the chemical structure is as follows:
The R&D personnel used PCC with 2 molar ratios to carry out the oxidation reaction.
Inadequate operation is an inevitable factor in flushing accidents, but it does not happen every time
