What is the definition of compressed gases according to the DOT?

The definition of compressed gases according to the Department of Transportation (DOT) is reliant on specific pressure thresholds. The correct answer specifies that a gas is considered compressed if it is under pressure exceeding 40 psi at a temperature of 70 degrees Fahrenheit. This definition ensures that materials classified under this category are managed correctly in terms of safety regulations and transportation.

Understanding this classification is crucial for handling compressed gases safely. These gases can become hazardous if not stored or transported under appropriate conditions. The pressure threshold is established to identify which gases require special handling due to their potential risks, such as explosion, leakage, or other hazards associated with high-pressure environments.

The specific nature of 40 psi at 70 degrees Fahrenheit provides a clear understanding for responders in the field and operators who may be involved in handling, transporting, or responding to incidents involving compressed gases. Knowing this threshold allows professionals to better assess risks and apply the right safety measures during emergency responses or routine inspections.