What is the specific gravity of water?

What is the specific gravity of water?

• A. 1
• B. 0.5
• C. 2
• D. 1.5

Answer: (A)

Specific gravity compares how dense a substance is to water, using water as the reference material. It’s a dimensionless ratio, so if a substance has the same density as water, its specific gravity is 1. Water is defined to have a density of about 1 g/cm³ at 4°C, which makes its specific gravity exactly 1. That’s why the correct answer is 1. The other options describe densities that are either lower or higher than water’s, not equal to it.

Specific gravity compares how dense a substance is to water, using water as the reference material. It’s a dimensionless ratio, so if a substance has the same density as water, its specific gravity is 1. Water is defined to have a density of about 1 g/cm³ at 4°C, which makes its specific gravity exactly 1. That’s why the correct answer is 1. The other options describe densities that are either lower or higher than water’s, not equal to it.