What is the specific gravity of Methane?

The specific gravity of a substance is a measure of its density compared to the density of a reference substance, typically water or air. In the case of methane (CH₄), its specific gravity is approximately 0.555 when compared to air at standard conditions. This means that methane is lighter than air, which is important in various applications, such as gas detection and combustion scenarios. Understanding that methane has a specific gravity less than 1 indicates that it will rise in the atmosphere, influencing how it disperses in the event of a leak or release. This property is crucial for safety protocols in handling and storing natural gas, as well as for environmental considerations.

The other options reflect specific gravities that do not accurately correspond to methane, either being too high or too low relative to its actual value when compared to air.