Which of the following is NOT a characteristic of a compressed gas?

The selection of low temperature gas state as the characteristic that is NOT associated with compressed gases is accurate because compressed gases can exist at varying temperatures. A compressed gas is primarily defined by its state of being stored under high pressure, which allows gases to occupy a smaller volume than they would under normal atmospheric conditions. The nature of gas under compression does not inherently mean it is at a low temperature; in fact, compression can lead to increased temperatures.

High pressure is a defining characteristic of compressed gases; they are stored in cylinders or containers that maintain significant pressure. There is also a potential for overfilling, considering that exceeded capacity can lead to dangerous situations, including ruptures or explosions. Furthermore, specific labeling is mandated for safety reasons, as it informs users of the hazards associated with the gas contained. This includes identifying the type of gas and any hazardous properties it may possess.

Thus, low temperature is not a standard characteristic of compressed gases, making it the correct choice.