Question 42Safety & Environmental - QMED

The correct answer is B) flammable or toxic gases. A tank or compartment is considered "gas free" when there is an absence of dangerous concentrations of flammable or toxic gases. This is the standard definition of "gas free" in the context of the US Coast Guard Captain's License Examinations. The tank or compartment must be free of any hazardous gaseous concentrations that could pose a safety risk. The other options are incorrect because they do not fully capture the definition of "gas free." Option A is too narrow, as it only considers flammable liquids. Option C is specific to cargo oil residues, which is not the general definition. Option D is also too narrow, as it only considers combustible liquids, rather than the broader category of flammable or toxic gases.