What is the specific gravity of butane?

The specific gravity of butane is typically around 0.58 when measured at 60°F, which indicates that butane is lighter than air. Specifically, specific gravity is defined as the ratio of the density of a substance to the density of a reference substance, usually air or water, depending on the context. When the specific gravity of a gas like butane is less than 1, it demonstrates that the gas will rise in the atmosphere, which is a critical factor in gas safety and handling procedures.

Understanding the specific gravity of combustible gases is essential for safety considerations in storage, transportation, and utilization, especially regarding potential leakage and dispersion into the environment. In the context of the provided options, the correct numerical range for butane's specific gravity distinguishes it from heavier gases such as propane or natural gas, which have higher specific gravities and different behaviors when released into the air.