What does specific gravity indicate about a material?

• A. It measures the material's acidity
• B. It compares the density of a material to water
• C. It indicates the temperature at which it will ignite
• D. It shows the vaporization rate of a substance

Answer: (B)

Specific gravity is a dimensionless quantity that provides a straightforward comparison of a material's density to that of water. When assessing specific gravity, the density of the material is divided by the density of water (which is typically 1 gram per cubic centimeter at 4 degrees Celsius). This comparison is crucial in determining whether a material will float or sink in water, influencing how it behaves in various environmental contexts and potential spill scenarios.

For example, if a substance has a specific gravity greater than 1, it will sink in water, which can have important implications during HAZMAT incidents. Conversely, a specific gravity of less than 1 indicates that the substance will float. Understanding specific gravity is essential for first responders and hazardous material technicians when evaluating risks and determining appropriate handling methods.