Ace the CWEA Mechanical Technologist Test 2026 – Launch Your Engineering Career with Confidence!

The specific gravity of chlorine is approximately 2.5, which means that chlorine is 2.5 times heavier than water. Specific gravity is a dimensionless quantity that compares the density of a substance to the density of a reference substance, typically water for liquids and gases. A specific gravity greater than 1 indicates that the substance is denser than water.

Chlorine gas, when measured under standard conditions, has a density that supports this specific gravity value. In contrast, a specific gravity of 1.0 indicates a substance that has the same density as water, while a value less than 1 (like 0.9) would indicate a substance that is lighter than water. Therefore, the correct understanding of chlorine's properties aligns with the specific gravity of 2.5, reflecting its density characteristics in comparison to water.