Why can large spills of refrigerants cause suffocation?

Large spills of refrigerants can cause suffocation primarily because they are heavier than air. When refrigerants leak or spill, they can accumulate in low-lying areas, displacing oxygen and creating an asphyxiating environment. This is particularly dangerous in confined spaces where there is limited air circulation, making it difficult for a person to breathe.

Inhalation of refrigerants in high concentrations can lead to a lack of oxygen, and since these substances can settle close to the ground, it puts individuals at risk of suffocation if the area is not properly ventilated. Ensuring safety requires awareness of the physical properties of refrigerants, including their density relative to air, to prevent dangerous situations in case of leaks or spills.

The other options don't accurately explain the suffocation risk associated with refrigerants. For instance, while refrigerants may react with air under certain conditions, this is not a common factor in creating suffocation hazards. Similarly, refrigerants do not typically absorb moisture in a manner that would pose a risk of suffocation, and although some refrigerants can emit toxic vapors, it is their density and ability to displace oxygen that directly leads to suffocation risk in a spill scenario.