What characterizes LNG?

Liquefied Natural Gas (LNG) is characterized as a colorless, odorless, and non-toxic gas. This description is crucial for understanding how LNG behaves in different environments and its implications for safety during handling and transport.

LNG is produced by cooling natural gas to a liquid state, which occurs at approximately -162 degrees Celsius (-260 degrees Fahrenheit). In this state, it is primarily methane and retains its properties: being colorless and odorless, which reduces the likelihood of detection in the event of a leak. This property emphasizes the importance of safety measures and monitoring when working with LNG, as the lack of an odor can prevent early detection of leaks that could lead to dangerous situations.

The other characteristics mentioned in the options do not apply to LNG. For example, LNG is not a solid at room temperature, nor is it heavier than air; in fact, it is lighter than air in its gaseous form. Also, while it is indeed a carbon-based fuel, its carbon content is more relevant for determining its environmental impact and combustion properties rather than being a distinguishing characteristic. Thus, understanding that LNG is a colorless, odorless, and non-toxic gas is essential for comprehensive safety and handling protocols.