What is true about a safety can?

A safety can is designed with specific features to enhance safety during the handling and storage of flammable liquids. One key characteristic is that it should have a spout cover designed to prevent spills. This feature is critical because it minimizes the risk of accidental leakage or spillage while pouring, which can lead to hazardous situations, including fire risks. The construction of the spout cover is intended to ensure that when the contents are being dispensed, the flow is controlled and that the can can be sealed securely when not in use.

The other features and functions of safety cans, while important, do not directly address their primary safety function as highlighted by the correct answer. For instance, safety cans are typically limited to a capacity of 5 gallons or less to reduce the risk associated with flammable liquids. They may indeed be used for transporting hazardous materials, but the primary reason for their design and regulation lies in the features that prevent hazards during use, such as leaks or spills. Similarly, while safety cans are often designed with pressure relief features, they are not strictly required to relieve internal pressure, making the spout cover a more defining characteristic of their safety role.